638008794 has 24 divisors (see below), whose sum is σ = 1382858100. Its totient is φ = 212591808.

The previous prime is 638008783. The next prime is 638008801. The reversal of 638008794 is 497800836.

It is a happy number.

638008794 is a `hidden beast` number, since 638 + 0 + 0 + 8 + 7 + 9 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 563825025 + 74183769 = 23745^2 + 8613^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65982 + ... + 75030.

Almost surely, 2^638008794 is an apocalyptic number.

638008794 is an abundant number, since it is smaller than the sum of its proper divisors (744849306).

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

638008794 is a wasteful number, since it uses less digits than its factorization.

638008794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12974 (or 12971 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 638008794 is about 25258.8359589273. The cubic root of 638008794 is about 860.8792135109.

The spelling of 638008794 in words is "six hundred thirty-eight million, eight thousand, seven hundred ninety-four".