639879224 has 16 divisors (see below), whose sum is σ = 1210392720. Its totient is φ = 317107840.

The previous prime is 639879211. The next prime is 639879281. The reversal of 639879224 is 422978936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353012 + ... + 354819.

It is an arithmetic number, because the mean of its divisors is an integer number (75649545).

Almost surely, 2^639879224 is an apocalyptic number.

It is an amenable number.

639879224 is a deficient number, since it is larger than the sum of its proper divisors (570513496).

639879224 is a wasteful number, since it uses less digits than its factorization.

639879224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707950 (or 707946 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 50.

The square root of 639879224 is about 25295.8341234283. The cubic root of 639879224 is about 861.7196634349.

The spelling of 639879224 in words is "six hundred thirty-nine million, eight hundred seventy-nine thousand, two hundred twenty-four".