638765372 has 36 divisors (see below), whose sum is σ = 1302900984. Its totient is φ = 273218400.

The previous prime is 638765359. The next prime is 638765399. The reversal of 638765372 is 273567836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106247 + ... + 112097.

It is an arithmetic number, because the mean of its divisors is an integer number (36191694).

Almost surely, 2^638765372 is an apocalyptic number.

It is an amenable number.

638765372 is an abundant number, since it is smaller than the sum of its proper divisors (664135612).

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

638765372 is a wasteful number, since it uses less digits than its factorization.

638765372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6426 (or 6417 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 47.

The square root of 638765372 is about 25273.8080233272. The cubic root of 638765372 is about 861.2193681681.

The spelling of 638765372 in words is "six hundred thirty-eight million, seven hundred sixty-five thousand, three hundred seventy-two".