•
80,000 = Since January 2024, the daily URL save limit for
YouTube for the
Wayback Machine •
80,782 =
Pell number P14 •
81,081 = smallest
abundant number ending in 1, 3, 7, or 9 •
81,181 = number of reduced trees with 25 nodes •
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. •
82,025 = number of primes \leq 2^{20}. •
82,467 = number of square (0,1)-matrices without zero rows and with exactly 6 entries equal to 1 •
82,656 =
Kaprekar number: 826562 = 6832014336; 68320 + 14336 = 82656 •
82,944 = 3-
smooth number: 210 × 34 •
83,097 =
Riordan number •
83,160 = the 29th
highly composite number •
83,357 =
Friedman prime •
83,521 = 174 •
84,187 – number of parallelogram polyominoes with 15 cells. •
84,375 = 33×55 •
84,672 = number of primitive polynomials of degree 21 over GF(2) •
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 •
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
Primes There are 876 prime numbers between 80000 and 90000. ==See also==