# 70 (number)

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{{Infobox number
| number = 70
| factorization=2 x 5 x 7
| divisor = 1, 2, 5, 7, 10, 14, 35, 70
| lang1 =  [Hebrew](/source/Hebrew_numerals)
| lang1 symbol = <span style="font-size:150%;">ע</span> 
| lang2 =  [Lao](/source/Lao_numerals)
| lang2 symbol = <span style="font-size:127%;">໗</span>
| lang3=[Armenian](/source/Armenian_numerals)|lang3 symbol=Հ
| lang4=[Babylonian numeral](/source/Babylonian_cuneiform_numerals)|lang4 symbol=𒐕𒌋
| lang5=[Egyptian hieroglyph](/source/Egyptian_numerals)|lang5 symbol=<span style="font-size:300%;">𓎌</span>
}}

'''70''' ('''seventy''') is the natural number following [69](/source/69_(number)) and preceding [71](/source/71_(number)).

== Mathematics ==
70 is a [composite](/source/Composite_number) number, an [Erdős–Woods number](/source/Erd%C5%91s%E2%80%93Woods_number)<ref>{{cite web |title=Sloane's A059756 : Erdős-Woods numbers |url=https://oeis.org/A059756 |access-date=2016-05-29 |website=The On-Line Encyclopedia of Integer Sequences |publisher=OEIS Foundation}}</ref>, a [Pell number](/source/Pell_number), a [central binomial coefficient](/source/central_binomial_coefficient)<ref>{{Cite OEIS|A000984|Central binomial coefficients: binomial(2*n,n) as  (2*n)!/(n!)^2.}}</ref>, and a [primitive abundant number](/source/primitive_abundant_number). 70 is the smallest [weird number](/source/weird_number), which is a natural number that is [abundant](/source/Abundant_number) but not [semiperfect](/source/semiperfect).<ref>{{cite web|title=Sloane's A006037 : Weird numbers|url=https://oeis.org/A006037|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref>

70 is also part of the only nontrivial solution pair to the [cannonball problem](/source/cannonball_problem), along with [24](/source/24_(number)).

== In religion ==
* In [Jewish](/source/Judaism) tradition, [Ptolemy II Philadelphus](/source/Ptolemy_II_Philadelphus) ordered 72 Jewish elders to translate the [Torah](/source/Torah) into [Greek](/source/Greek_language); the result was the [Septuagint](/source/Septuagint) (from the [Latin](/source/Latin_language) for "seventy"). The Roman numeral seventy, LXX, is the scholarly symbol for the Septuagint.

* In Islamic history and in Islamic interpretation the number 70 or 72 is most often and generally hyperbole for an infinite amount:
** There are 70 dead among [Muhammad](/source/Muhammad)'s adversaries during the [Battle of Badr](/source/Battle_of_Badr).
** 70 of Muhammad's followers are martyred at the [Battle of Uhud](/source/Battle_of_Uhud).
** In [Shia Islam](/source/Shia_Islam), there are 70 martyrs among [Imam Hussein](/source/Imam_Hussein)'s followers during the [Battle of Karbala](/source/Battle_of_Karbala).

== In other fields ==
* In some traditions, 70 years of marriage is marked by a [platinum](/source/platinum) [wedding anniversary](/source/wedding_anniversary).
* Under [Social Security (United States)](/source/Social_Security_(United_States)), the age at which a person can receive the maximum retirement benefits (and may do so and continue working without reduction of benefits).

== Number name ==
{{Main article|Numeral (linguistics)}}
{{Wiktionary|seventy}}

Several languages, especially ones with [vigesimal](/source/vigesimal) number systems, do not have a specific word for 70: for example, {{Langx|fr|soixante-dix|lit=sixty-ten}}; {{Langx|da|halvfjerds}}, short for {{Langx|da|halvfjerdsindstyve|lit=three and a half score|label=none}}. (For French, this is true only in France, Canada and Luxembourg; other French-speaking regions such as [Belgium](/source/Belgium), [Switzerland](/source/Switzerland), [Aosta Valley](/source/Aosta_Valley) and [Jersey](/source/Jersey) use {{Lang|fr|septante}}.)<ref>Peter Higgins, ''Number Story''. London: Copernicus Books (2008): 19. "Belgian French speakers however grew tired of this and introduced the new names septante, octante, nonante etc. for these numbers".</ref>

== Notes ==
{{Notelist}}

== References ==
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{{Reflist}}

== External links ==
{{Integers|zero}}
{{Authority control}}

{{DEFAULTSORT:70 (Number)}}
Category:Integers

[la:Septuaginta](/source/la%3ASeptuaginta)

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Adapted from the Wikipedia article [70 (number)](https://en.wikipedia.org/wiki/70_(number)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/70_(number)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.