638775804 has 12 divisors (see below), whose sum is σ = 1490476904. Its totient is φ = 212925264.

The previous prime is 638775773. The next prime is 638775827. The reversal of 638775804 is 408577836.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26615647 + ... + 26615670.

Almost surely, 2^638775804 is an apocalyptic number.

It is an amenable number.

638775804 is an abundant number, since it is smaller than the sum of its proper divisors (851701100).

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

638775804 is a wasteful number, since it uses less digits than its factorization.

638775804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53231324 (or 53231322 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The square root of 638775804 is about 25274.0144021483. The cubic root of 638775804 is about 861.2240564788.

The spelling of 638775804 in words is "six hundred thirty-eight million, seven hundred seventy-five thousand, eight hundred four".