639967082 has 12 divisors (see below), whose sum is σ = 1013134626. Its totient is φ = 303141960.

The previous prime is 639967079. The next prime is 639967117. The reversal of 639967082 is 280769936.

639967082 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 340365601 + 299601481 = 18449^2 + 17309^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 639967082.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 442469 + ... + 443912.

Almost surely, 2^639967082 is an apocalyptic number.

639967082 is a deficient number, since it is larger than the sum of its proper divisors (373167544).

639967082 is a wasteful number, since it uses less digits than its factorization.

639967082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886421 (or 886402 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 639967082 is about 25297.5706738809. The cubic root of 639967082 is about 861.7591008259.

The spelling of 639967082 in words is "six hundred thirty-nine million, nine hundred sixty-seven thousand, eighty-two".