646668904 has 16 divisors (see below), whose sum is σ = 1385719200. Its totient is φ = 277143792.

The previous prime is 646668901. The next prime is 646668931. The reversal of 646668904 is 409866646.

It is a super-2 number, since 2×646668904² = 836361342801122432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646668901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5773774 + ... + 5773885.

It is an arithmetic number, because the mean of its divisors is an integer number (86607450).

Almost surely, 2^646668904 is an apocalyptic number.

It is an amenable number.

646668904 is an abundant number, since it is smaller than the sum of its proper divisors (739050296).

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

646668904 is a wasteful number, since it uses less digits than its factorization.

646668904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11547672 (or 11547668 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The square root of 646668904 is about 25429.6854876343. The cubic root of 646668904 is about 864.7568135909.

The spelling of 646668904 in words is "six hundred forty-six million, six hundred sixty-eight thousand, nine hundred four".