90000 (number)

90,000 (ninety thousand) is the natural number that comes after 89,999 and before 90,001.

Selected numbers in the range 90000–99999

• 90000 – sum of the cubes of the first 24 positive integers, square of 300.
• 90625 – the only five-digit automorphic number: 90625² = 8212890625^[1]
• 93312 – Leyland number: 6⁶ + 6^6[2]
• 94249 – palindromic square: 307²
• 94932 – Leyland number: 7⁵ + 5^7[2]
• 95121 – Kaprekar number: 95121² = 9048004641; 90480 + 04641 = 95121^[3]
• 96557 – Markov number: 5² + 6466² + 96557² = 3 × 5 × 6466 × 96557^[4]
• 99066 – largest number whose square uses all of the decimal digits once: 99066² = 9814072356. It is also a rotationally symmetric ambigram in decimal.
• 99991 - largest five-digit prime number
• 99999 – repdigit, Kaprekar number: 99999² = 9999800001; 99998 + 00001 = 99999^[3]

References