90988 has 18 divisors (see below), whose sum is σ = 170324. Its totient is φ = 42504.

The previous prime is 90977. The next prime is 90989. The reversal of 90988 is 88909.

It is a super-2 number, since 2×90988² = 16557632288, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (90989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2095 + ... + 2137.

2⁹⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

90988 is a deficient number, since it is larger than the sum of its proper divisors (79336).

90988 is a wasteful number, since it uses less digits than its factorization.

90988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 90988 is about 301.6421721179. The cubic root of 90988 is about 44.9774372487.

The spelling of 90988 in words is "ninety thousand, nine hundred eighty-eight".