638512804 has 12 divisors (see below), whose sum is σ = 1120132300. Its totient is φ = 318475008.

The previous prime is 638512799. The next prime is 638512873. The reversal of 638512804 is 408215836.

It is a happy number.

638512804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 301716900 + 336795904 = 17370^2 + 18352^2 .

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, 193509 + ... + 196780.

Almost surely, 2^638512804 is an apocalyptic number.

It is an amenable number.

638512804 is a deficient number, since it is larger than the sum of its proper divisors (481619496).

638512804 is a wasteful number, since it uses less digits than its factorization.

638512804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390702 (or 390700 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 638512804 is about 25268.8108940646. The cubic root of 638512804 is about 861.1058444144.

The spelling of 638512804 in words is "six hundred thirty-eight million, five hundred twelve thousand, eight hundred four".