18090664 has 16 divisors (see below), whose sum is σ = 35090100. Its totient is φ = 8733312.

The previous prime is 18090643. The next prime is 18090689. The reversal of 18090664 is 46609081.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 96100 = 4242^2 + 310^2 .

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, 38757 + ... + 39220.

Almost surely, 2^18090664 is an apocalyptic number.

It is an amenable number.

18090664 is a deficient number, since it is larger than the sum of its proper divisors (16999436).

18090664 is a wasteful number, since it uses less digits than its factorization.

18090664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78012 (or 78008 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18090664 is about 4253.3121211592. The cubic root of 18090664 is about 262.5134154897.

The spelling of 18090664 in words is "eighteen million, ninety thousand, six hundred sixty-four".