639196684 has 24 divisors (see below), whose sum is σ = 1288159488. Its totient is φ = 271848720.

The previous prime is 639196673. The next prime is 639196697. The reversal of 639196684 is 486691936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83464 + ... + 90799.

It is an arithmetic number, because the mean of its divisors is an integer number (53673312).

Almost surely, 2^639196684 is an apocalyptic number.

It is an amenable number.

639196684 is an abundant number, since it is smaller than the sum of its proper divisors (648962804).

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

639196684 is a wasteful number, since it uses less digits than its factorization.

639196684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174405 (or 174403 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The square root of 639196684 is about 25282.3393696074. The cubic root of 639196684 is about 861.4131642474.

The spelling of 639196684 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, six hundred eighty-four".