639599012 has 24 divisors (see below), whose sum is σ = 1206224376. Its totient is φ = 294997248.

The previous prime is 639598987. The next prime is 639599021. The reversal of 639599012 is 210995936.

It can be written as a sum of positive squares in 4 ways, for example, as 20286016 + 619312996 = 4504^2 + 24886^2 .

It is a super-2 number, since 2×639599012² = 818173792302752288, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 94328 + ... + 100880.

It is an arithmetic number, because the mean of its divisors is an integer number (50259349).

Almost surely, 2^639599012 is an apocalyptic number.

It is an amenable number.

639599012 is a deficient number, since it is larger than the sum of its proper divisors (566625364).

639599012 is a wasteful number, since it uses less digits than its factorization.

639599012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8447 (or 8445 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 639599012 is about 25290.2948183686. The cubic root of 639599012 is about 861.5938587326.

The spelling of 639599012 in words is "six hundred thirty-nine million, five hundred ninety-nine thousand, twelve".