639213056 has 160 divisors (see below), whose sum is σ = 1470763008. Its totient is φ = 275742720.

The previous prime is 639213037. The next prime is 639213077. The reversal of 639213056 is 650312936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6205901 + ... + 6206003.

Almost surely, 2^639213056 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 639213056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735381504).

639213056 is an abundant number, since it is smaller than the sum of its proper divisors (831549952).

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

639213056 is a wasteful number, since it uses less digits than its factorization.

639213056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 639213056 is about 25282.6631508629. The cubic root of 639213056 is about 861.4205187578.

The spelling of 639213056 in words is "six hundred thirty-nine million, two hundred thirteen thousand, fifty-six".