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Natural number
80,000 (eighty thousand) is the natural number after 79,999 and before 80,001.
Selected numbers in the range 80,000–89,999
- 80,782 = Pell number P14[1]
- 81,081 = smallest 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 .[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: 826562 = 6832014336; 68320 + 14336 = 82656[7]
- 82,944 = 3-smooth number: 210 × 34
- 83,097 = Riordan number
- 83,160 = highly composite number[8]
- 83,357 = 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 in a day: 24 × 60 × 60 and common DNS default time to live
- 87,360 = unitary perfect number[13]
- 88,789 = the start of a prime 9-tuple, along with 88793, 88799, 88801, 88807, 88811, 88813, 88817, and 88819.
- 88,888 = repdigit
- 89,134 = number of partitions of 45[14]
Primes
There are 876 prime numbers between 80000 and 90000.