639658796 has 48 divisors (see below), whose sum is σ = 1413490176. Its totient is φ = 246791424.

The previous prime is 639658793. The next prime is 639658823. The reversal of 639658796 is 697856936.

It is not an unprimeable number, because it can be changed into a prime (639658793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18266 + ... + 40161.

It is an arithmetic number, because the mean of its divisors is an integer number (29447712).

Almost surely, 2^639658796 is an apocalyptic number.

It is an amenable number.

639658796 is an abundant number, since it is smaller than the sum of its proper divisors (773831380).

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

639658796 is a wasteful number, since it uses less digits than its factorization.

639658796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58478 (or 58476 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 59.

The square root of 639658796 is about 25291.4767461293. The cubic root of 639658796 is about 861.6207025944.

The spelling of 639658796 in words is "six hundred thirty-nine million, six hundred fifty-eight thousand, seven hundred ninety-six".