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 92,205 = number of 23-bead necklaces (turning over is allowed) where complements are equivalent 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 95,040 = the order of the Mathieu group M12 95,420 = number of 22-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed 96,557 = Markov number: 52 + 64662 + 965572 = 3 × 5 × 6466 × 96557 97,336 = 463, the largest 5-digit cube 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. 99,719 = The largest five-digit number that is a left-and-right-truncatable prime 99,856 = 3162, the largest 5-digit square 99,991 = largest five-digit prime number 99,999 = repdigit, Kaprekar number: 999992 = 9999800001; 99998 + 00001 = 99999
Primes There are 879 prime numbers between 90000 and 100000.
References
External links Media related to 90000 (number) at Wikimedia Commons