639463812 has 96 divisors (see below), whose sum is σ = 1644461952. Its totient is φ = 192208896.

The previous prime is 639463807. The next prime is 639463837. The reversal of 639463812 is 218364936.

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 31 ways as a sum of consecutive naturals, for example, 2017078 + ... + 2017394.

It is an arithmetic number, because the mean of its divisors is an integer number (17129812).

Almost surely, 2^639463812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639463812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822230976).

639463812 is an abundant number, since it is smaller than the sum of its proper divisors (1004998140).

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

639463812 is a wasteful number, since it uses less digits than its factorization.

639463812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597 (or 595 counting only the distinct ones).

The product of its digits is 186624, while the sum is 42.

The square root of 639463812 is about 25287.6217149814. The cubic root of 639463812 is about 861.5331458504.

The spelling of 639463812 in words is "six hundred thirty-nine million, four hundred sixty-three thousand, eight hundred twelve".