638131952 has 20 divisors (see below), whose sum is σ = 1243532760. Its totient is φ = 317220288.

The previous prime is 638131951. The next prime is 638131961. The reversal of 638131952 is 259131836.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638131951) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 112502 + ... + 118037.

It is an arithmetic number, because the mean of its divisors is an integer number (62176638).

Almost surely, 2^638131952 is an apocalyptic number.

It is an amenable number.

638131952 is a deficient number, since it is larger than the sum of its proper divisors (605400808).

638131952 is a wasteful number, since it uses less digits than its factorization.

638131952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230720 (or 230714 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 638131952 is about 25261.2737604421. The cubic root of 638131952 is about 860.9346032076.

The spelling of 638131952 in words is "six hundred thirty-eight million, one hundred thirty-one thousand, nine hundred fifty-two".