90,000

90,000 (ninety thousand) is the natural number following 89,999 and preceding 90,001. It is the sum of the cubes of the first 24 positive integers, and is the square of 300.

Selected numbers in the range 90,000–99,999

 * 90,625 = the only five-digit automorphic number: 906252 = 8212890625
 * 91,125 = 453
 * 91,144 = Fine number
 * 93,312 = Leyland number: 66 + 66. Also a 3-smooth number.
 * 94,249 = palindromic square: 3072
 * 94,932 = Leyland number: 75 + 57
 * 95,121 = Kaprekar number: 951212 = 9048004641; 90480 + 04641 = 95121
 * 96,557 = Markov number: 52 + 64662 + 965572 = 3 × 5 × 6466 × 96557
 * 97,336 = 463
 * 98,304 = 3-smooth number
 * 99,066 = largest number whose square uses all of the decimal digits once: 990662 = 9814072356. It is also strobogrammatic in decimal.
 * 99,991 = largest five-digit prime number
 * 99,999 = repdigit, Kaprekar number: 999992 = 9999800001; 99998 + 00001 = 99999