# 80,000

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**80,000** (**eighty thousand**) is the [natural number](/source/Natural_number) after [79,999](/source/70,000#79000_to_79999) and before 80,001.

## Selected numbers in the range 80,000–89,999

- **80,000** = Since January 2024, the daily URL save limit for [YouTube](/source/YouTube) for the [Wayback Machine](/source/Wayback_Machine)
- **80,782** = [Pell number](/source/Pell_number) *P*14[1]
- **81,081** = smallest [abundant number](/source/Abundant_number) ending in 1, 3, 7, or 9
- **81,181** = number of reduced trees with 25 nodes[2]
- **82,000** = the only currently known number greater than 1 that can be written in bases from 2 through 5 using only 0s and 1s.[3][4]
- **82,025** = number of primes \leq 2^{20}.[5]
- **82,467** = number of square (0,1)-matrices without zero rows and with exactly 6 entries equal to 1[6]
- **82,656** = [Kaprekar number](/source/Kaprekar_number): 826562 = 6832014336; 68320 + 14336 = 82656[7]
- **82,944** = 3-[smooth number](/source/Smooth_number): 210 × 34
- **83,097** = [Riordan number](https://oeis.org/A005043)
- **83,160** = the 29th [highly composite number](/source/Highly_composite_number)[8]
- **83,357** = [Friedman prime](/source/Friedman_prime)[9]
- **83,521** = 174
- **84,187** – number of parallelogram polyominoes with 15 cells.[10]
- **84,375** = 33×55[11]
- **84,672** = number of primitive polynomials of degree 21 over GF(2)[12]
- **85,085** = product of five consecutive primes: 5 × 7 × 11 × 13 × 17
- **85,184** = 443
- **86,400** = [seconds](/source/Second) in a [day](/source/Day): 24 × 60 × 60 and common DNS default [time to live](/source/Time_to_live)
- **87,360** = [unitary perfect number](/source/Unitary_perfect_number)[13]
- **88,789** = the start of a [prime 9-tuple](/source/Prime_k-tuple), along with 88793, 88799, 88801, 88807, 88811, 88813, 88817, and 88819.
- **88,888** = [repdigit](/source/Repdigit)
- **89,134** = number of partitions of 45[14]

### Primes

There are 876 prime numbers between 80000 and 90000.

## See also

- [80,000 Hours](/source/80,000_Hours), a British social impact career advisory organization

## References

1. Retrieved 2016-06-16.

1. Sequence [A146025](http://oeis.org/A146025) in The On-Line Encyclopedia of Integer Sequences

1. Sequence [A258107](http://oeis.org/A258107) in The On-Line Encyclopedia of Integer Sequences

1. Retrieved 2022-06-02.

1. Retrieved 2016-06-16.

1. Retrieved 2016-06-16.

1. Retrieved 2016-06-16.

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Adapted from the Wikipedia article [80,000](https://en.wikipedia.org/wiki/80%2C000) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/80%2C000?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.