639712312 has 16 divisors (see below), whose sum is σ = 1270017360. Its totient is φ = 301041024.

The previous prime is 639712309. The next prime is 639712313. The reversal of 639712312 is 213217936.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639712313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351748 + ... + 2352019.

It is an arithmetic number, because the mean of its divisors is an integer number (79376085).

Almost surely, 2^639712312 is an apocalyptic number.

It is an amenable number.

639712312 is a deficient number, since it is larger than the sum of its proper divisors (630305048).

639712312 is a wasteful number, since it uses less digits than its factorization.

639712312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4703790 (or 4703786 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 639712312 is about 25292.5347088820. The cubic root of 639712312 is about 861.6447306168.

The spelling of 639712312 in words is "six hundred thirty-nine million, seven hundred twelve thousand, three hundred twelve".