90521664 has 28 divisors (see below), whose sum is σ = 239505744. Its totient is φ = 30173824.

The previous prime is 90521659. The next prime is 90521687. The reversal of 90521664 is 46612509.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235542 + ... + 235925.

Almost surely, 2^90521664 is an apocalyptic number.

It is an amenable number.

90521664 is an abundant number, since it is smaller than the sum of its proper divisors (148984080).

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

90521664 is a wasteful number, since it uses less digits than its factorization.

90521664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471482 (or 471472 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 90521664 is about 9514.2873616472. The cubic root of 90521664 is about 449.0046543599.

The spelling of 90521664 in words is "ninety million, five hundred twenty-one thousand, six hundred sixty-four".