90816564 has 12 divisors (see below), whose sum is σ = 211905344. Its totient is φ = 30272184.

The previous prime is 90816547. The next prime is 90816587. The reversal of 90816564 is 46561809.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3784012 + ... + 3784035.

Almost surely, 2^90816564 is an apocalyptic number.

It is an amenable number.

90816564 is an abundant number, since it is smaller than the sum of its proper divisors (121088780).

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

90816564 is a wasteful number, since it uses less digits than its factorization.

90816564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7568054 (or 7568052 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 90816564 is about 9529.7725051546. The cubic root of 90816564 is about 449.4917125111.

The spelling of 90816564 in words is "ninety million, eight hundred sixteen thousand, five hundred sixty-four".