638039976 has 48 divisors (see below), whose sum is σ = 1855527840. Its totient is φ = 182296800.

The previous prime is 638039959. The next prime is 638039981. The reversal of 638039976 is 679930836.

It is a happy number.

638039976 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 270100 + ... + 272451.

It is an arithmetic number, because the mean of its divisors is an integer number (38656830).

Almost surely, 2^638039976 is an apocalyptic number.

It is an amenable number.

638039976 is an abundant number, since it is smaller than the sum of its proper divisors (1217487864).

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

638039976 is a wasteful number, since it uses less digits than its factorization.

638039976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542574 (or 542563 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 51.

The square root of 638039976 is about 25259.4532007326. The cubic root of 638039976 is about 860.8932381339.

It can be divided in two parts, 638039 and 976, that added together give a triangular number (639015 = T₁₁₃₀).

The spelling of 638039976 in words is "six hundred thirty-eight million, thirty-nine thousand, nine hundred seventy-six".