639082944 has 168 divisors, whose sum is σ = 1903219968. Its totient is φ = 204871680.

The previous prime is 639082901. The next prime is 639082963. The reversal of 639082944 is 449280936.

639082944 is a `hidden beast` number, since 639 + 0 + 8 + 2 + 9 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639082944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3345889 + ... + 3346079.

Almost surely, 2^639082944 is an apocalyptic number.

639082944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639082944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951609984).

639082944 is an abundant number, since it is smaller than the sum of its proper divisors (1264137024).

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

639082944 is a wasteful number, since it uses less digits than its factorization.

639082944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 639082944 is about 25280.0898732580. The cubic root of 639082944 is about 861.3620673275.

The spelling of 639082944 in words is "six hundred thirty-nine million, eighty-two thousand, nine hundred forty-four".