639951036 has 48 divisors (see below), whose sum is σ = 1520945664. Its totient is φ = 209379456.

The previous prime is 639951031. The next prime is 639951079. The reversal of 639951036 is 630159936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639951031) 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 in 15 ways as a sum of consecutive naturals, for example, 250381 + ... + 252923.

It is an arithmetic number, because the mean of its divisors is an integer number (31686368).

Almost surely, 2^639951036 is an apocalyptic number.

It is an amenable number.

639951036 is an abundant number, since it is smaller than the sum of its proper divisors (880994628).

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

639951036 is a wasteful number, since it uses less digits than its factorization.

639951036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930 (or 2928 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 639951036 is about 25297.2535268159. The cubic root of 639951036 is about 861.7518984231.

The spelling of 639951036 in words is "six hundred thirty-nine million, nine hundred fifty-one thousand, thirty-six".