638582352 has 20 divisors (see below), whose sum is σ = 1649671200. Its totient is φ = 212860768.

The previous prime is 638582317. The next prime is 638582363. The reversal of 638582352 is 253285836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6651852 + ... + 6651947.

It is an arithmetic number, because the mean of its divisors is an integer number (82483560).

Almost surely, 2^638582352 is an apocalyptic number.

It is an amenable number.

638582352 is an abundant number, since it is smaller than the sum of its proper divisors (1011088848).

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

638582352 is a wasteful number, since it uses less digits than its factorization.

638582352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13303810 (or 13303804 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 638582352 is about 25270.1870194900. The cubic root of 638582352 is about 861.1371076951.

The spelling of 638582352 in words is "six hundred thirty-eight million, five hundred eighty-two thousand, three hundred fifty-two".