639564472 has 32 divisors (see below), whose sum is σ = 1303027200. Its totient is φ = 293176800.

The previous prime is 639564433. The next prime is 639564493. The reversal of 639564472 is 274465936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63154 + ... + 72577.

It is an arithmetic number, because the mean of its divisors is an integer number (40719600).

Almost surely, 2^639564472 is an apocalyptic number.

639564472 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

639564472 is an abundant number, since it is smaller than the sum of its proper divisors (663462728).

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

639564472 is a wasteful number, since it uses less digits than its factorization.

639564472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135787 (or 135783 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 46.

The square root of 639564472 is about 25289.6119385015. The cubic root of 639564472 is about 861.5783490216.

The spelling of 639564472 in words is "six hundred thirty-nine million, five hundred sixty-four thousand, four hundred seventy-two".