639336676 has 24 divisors (see below), whose sum is σ = 1246525056. Its totient is φ = 284423520.

The previous prime is 639336661. The next prime is 639336769. The reversal of 639336676 is 676633936.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152511 + ... + 156646.

It is an arithmetic number, because the mean of its divisors is an integer number (51938544).

Almost surely, 2^639336676 is an apocalyptic number.

It is an amenable number.

639336676 is a deficient number, since it is larger than the sum of its proper divisors (607188380).

639336676 is a wasteful number, since it uses less digits than its factorization.

639336676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309219 (or 309217 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 49.

The square root of 639336676 is about 25285.1077909508. The cubic root of 639336676 is about 861.4760463786.

The spelling of 639336676 in words is "six hundred thirty-nine million, three hundred thirty-six thousand, six hundred seventy-six".