639929936 has 40 divisors (see below), whose sum is σ = 1266258240. Its totient is φ = 313226496.

The previous prime is 639929903. The next prime is 639929947.

639929936 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144491 + ... + 148853.

It is an arithmetic number, because the mean of its divisors is an integer number (31656456).

Almost surely, 2^639929936 is an apocalyptic number.

It is an amenable number.

639929936 is a deficient number, since it is larger than the sum of its proper divisors (626328304).

639929936 is a wasteful number, since it uses less digits than its factorization.

639929936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4563 (or 4557 counting only the distinct ones).

The product of its digits is 4251528, while the sum is 56.

The square root of 639929936 is about 25296.8364820584. The cubic root of 639929936 is about 861.7424273001.

The spelling of 639929936 in words is "six hundred thirty-nine million, nine hundred twenty-nine thousand, nine hundred thirty-six".