638878032 has 60 divisors (see below), whose sum is σ = 1925513044. Its totient is φ = 196577280.

The previous prime is 638878027. The next prime is 638878043. The reversal of 638878032 is 230878836.

638878032 is a `hidden beast` number, since 638 + 8 + 7 + 8 + 0 + 3 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 427000896 + 211877136 = 20664^2 + 14556^2 .

It is a congruent number.

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, 168769 + ... + 172512.

Almost surely, 2^638878032 is an apocalyptic number.

It is an amenable number.

638878032 is an abundant number, since it is smaller than the sum of its proper divisors (1286635012).

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

638878032 is a wasteful number, since it uses less digits than its factorization.

638878032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341308 (or 341299 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 638878032 is about 25276.0367146434. The cubic root of 638878032 is about 861.2699967060.

The spelling of 638878032 in words is "six hundred thirty-eight million, eight hundred seventy-eight thousand, thirty-two".