664904188 has 12 divisors (see below), whose sum is σ = 1253088760. Its totient is φ = 306878832.

The previous prime is 664904179. The next prime is 664904203. The reversal of 664904188 is 881409466.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 6393258 + ... + 6393361.

Almost surely, 2^664904188 is an apocalyptic number.

It is an amenable number.

664904188 is a deficient number, since it is larger than the sum of its proper divisors (588184572).

664904188 is a wasteful number, since it uses less digits than its factorization.

664904188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12786636 (or 12786634 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 664904188 is about 25785.7361345376. The cubic root of 664904188 is about 872.8099518643.

The spelling of 664904188 in words is "six hundred sixty-four million, nine hundred four thousand, one hundred eighty-eight".