639424936 has 32 divisors (see below), whose sum is σ = 1282730400. Its totient is φ = 297915840.

The previous prime is 639424901. The next prime is 639424937.

639424936 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (639424937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25210 + ... + 43753.

It is an arithmetic number, because the mean of its divisors is an integer number (40085325).

Almost surely, 2^639424936 is an apocalyptic number.

It is an amenable number.

639424936 is an abundant number, since it is smaller than the sum of its proper divisors (643305464).

639424936 is a wasteful number, since it uses less digits than its factorization.

639424936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69049 (or 69045 counting only the distinct ones).

The product of its digits is 839808, while the sum is 46.

The square root of 639424936 is about 25286.8530268201. The cubic root of 639424936 is about 861.5156866183.

The spelling of 639424936 in words is "six hundred thirty-nine million, four hundred twenty-four thousand, nine hundred thirty-six".