638932992 has 48 divisors (see below), whose sum is σ = 1703421720. Its totient is φ = 212975616.

The previous prime is 638932951. The next prime is 638933027. The reversal of 638932992 is 299239836.

It is a tau number, because it is divible by the number of its divisors (48).

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, 45853 + ... + 58140.

Almost surely, 2^638932992 is an apocalyptic number.

It is an amenable number.

638932992 is an abundant number, since it is smaller than the sum of its proper divisors (1064488728).

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

638932992 is a wasteful number, since it uses less digits than its factorization.

638932992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104018 (or 103998 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The square root of 638932992 is about 25277.1238870248. The cubic root of 638932992 is about 861.2946931474.

The spelling of 638932992 in words is "six hundred thirty-eight million, nine hundred thirty-two thousand, nine hundred ninety-two".