639580896 has 72 divisors (see below), whose sum is σ = 1822799160. Its totient is φ = 212726016.

The previous prime is 639580873. The next prime is 639580937. The reversal of 639580896 is 698085936.

639580896 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144411 + ... + 148773.

It is an arithmetic number, because the mean of its divisors is an integer number (25316655).

Almost surely, 2^639580896 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 639580896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911399580).

639580896 is an abundant number, since it is smaller than the sum of its proper divisors (1183218264).

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

639580896 is a wasteful number, since it uses less digits than its factorization.

639580896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4888 (or 4877 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 639580896 is about 25289.9366547249. The cubic root of 639580896 is about 861.5857240621.

The spelling of 639580896 in words is "six hundred thirty-nine million, five hundred eighty thousand, eight hundred ninety-six".