90,000
90,000 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.
90,210 = the zip code of the city in Beverly Hills, 9021090,625 = the only five-digit automorphic number: 906252 = 821289062591,125 = 45391,144 = Fine number92,205 = number of 23-bead necklaces where complements are equivalent93,312 = Leyland number: 66 + 66. Also a 3-smooth number.94,249 = palindromic square: 307294,932 = Leyland number: 75 + 5795,121 = Kaprekar number: 951212 = 9048004641; 90480 + 04641 = 9512195,420 = number of 22-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed96,557 = Markov number: 52 + 64662 + 965572 = 3 × 5 × 6466 × 9655797,336 = 463, the largest 5-digit cube98,304 = 3-smooth number99,066 = largest number whose square uses all of the decimal digits once: 990662 = 9814072356. It is also strobogrammatic in decimal.99,856 = 3162, the largest 5-digit square99,991 = largest five-digit prime number99,999 = repdigit, Kaprekar number: 999992 = 9999800001; 99998 + 00001 = 99999
Primes
There are 879 prime numbers between 90000 and 100000.