638563852 has 12 divisors (see below), whose sum is σ = 1120534240. Its totient is φ = 318411216.

The previous prime is 638563819. The next prime is 638563867. The reversal of 638563852 is 258365836.

It is an alternating number because its digits alternate between even and odd.

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, 216027 + ... + 218962.

Almost surely, 2^638563852 is an apocalyptic number.

It is an amenable number.

638563852 is a deficient number, since it is larger than the sum of its proper divisors (481970388).

638563852 is a wasteful number, since it uses less digits than its factorization.

638563852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435360 (or 435358 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The square root of 638563852 is about 25269.8209728522. The cubic root of 638563852 is about 861.1287917797.

The spelling of 638563852 in words is "six hundred thirty-eight million, five hundred sixty-three thousand, eight hundred fifty-two".