90591820 has 48 divisors (see below), whose sum is σ = 208202400. Its totient is φ = 32837120.

The previous prime is 90591817. The next prime is 90591821. The reversal of 90591820 is 2819509.

It is not an unprimeable number, because it can be changed into a prime (90591821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111576 + ... + 112384.

It is an arithmetic number, because the mean of its divisors is an integer number (4337550).

Almost surely, 2^90591820 is an apocalyptic number.

It is an amenable number.

90591820 is an abundant number, since it is smaller than the sum of its proper divisors (117610580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90591820 is a wasteful number, since it uses less digits than its factorization.

90591820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 90591820 is about 9517.9735238127. The cubic root of 90591820 is about 449.1206201035.

The spelling of 90591820 in words is "ninety million, five hundred ninety-one thousand, eight hundred twenty".