639356484 has 96 divisors (see below), whose sum is σ = 1700100864. Its totient is φ = 185518080.

The previous prime is 639356453. The next prime is 639356513. The reversal of 639356484 is 484653936.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260704 + ... + 263144.

It is an arithmetic number, because the mean of its divisors is an integer number (17709384).

Almost surely, 2^639356484 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 639356484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850050432).

639356484 is an abundant number, since it is smaller than the sum of its proper divisors (1060744380).

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

639356484 is a wasteful number, since it uses less digits than its factorization.

639356484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2557 (or 2555 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 48.

The square root of 639356484 is about 25285.4994809278. The cubic root of 639356484 is about 861.4849430689.

The spelling of 639356484 in words is "six hundred thirty-nine million, three hundred fifty-six thousand, four hundred eighty-four".