639319312 has 10 divisors (see below), whose sum is σ = 1238681198. Its totient is φ = 319659648.

The previous prime is 639319283. The next prime is 639319319. The reversal of 639319312 is 213913936.

It can be written as a sum of positive squares in only one way, i.e., 621205776 + 18113536 = 24924^2 + 4256^2 .

It is not an unprimeable number, because it can be changed into a prime (639319319) by changing a digit.

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 as a sum of consecutive naturals, namely, 19978713 + ... + 19978744.

Almost surely, 2^639319312 is an apocalyptic number.

It is an amenable number.

639319312 is a deficient number, since it is larger than the sum of its proper divisors (599361886).

639319312 is a wasteful number, since it uses less digits than its factorization.

639319312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39957465 (or 39957459 counting only the distinct ones).

The product of its digits is 26244, while the sum is 37.

The square root of 639319312 is about 25284.7644244513. The cubic root of 639319312 is about 861.4682472507.

The spelling of 639319312 in words is "six hundred thirty-nine million, three hundred nineteen thousand, three hundred twelve".