639628472 has 32 divisors (see below), whose sum is σ = 1407681120. Its totient is φ = 266716800.

The previous prime is 639628453. The next prime is 639628501. The reversal of 639628472 is 274826936.

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, 152279 + ... + 156422.

It is an arithmetic number, because the mean of its divisors is an integer number (43990035).

Almost surely, 2^639628472 is an apocalyptic number.

It is an amenable number.

639628472 is an abundant number, since it is smaller than the sum of its proper divisors (768052648).

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

639628472 is a wasteful number, since it uses less digits than its factorization.

639628472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308751 (or 308747 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 639628472 is about 25290.8772485258. The cubic root of 639628472 is about 861.6070868985.

The spelling of 639628472 in words is "six hundred thirty-nine million, six hundred twenty-eight thousand, four hundred seventy-two".