639888480 has 576 divisors, whose sum is σ = 2830464000. Its totient is φ = 127733760.

The previous prime is 639888467. The next prime is 639888493. The reversal of 639888480 is 84888936.

It is an interprime number because it is at equal distance from previous prime (639888467) and next prime (639888493).

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 3215421 + ... + 3215619.

It is an arithmetic number, because the mean of its divisors is an integer number (4914000).

Almost surely, 2^639888480 is an apocalyptic number.

639888480 is a gapful number since it is divisible by the number (60) 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 639888480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415232000).

639888480 is an abundant number, since it is smaller than the sum of its proper divisors (2190575520).

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

639888480 is a wasteful number, since it uses less digits than its factorization.

639888480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The square root of 639888480 is about 25296.0170777931. The cubic root of 639888480 is about 861.7238184058.

The spelling of 639888480 in words is "six hundred thirty-nine million, eight hundred eighty-eight thousand, four hundred eighty".