638328588 has 48 divisors (see below), whose sum is σ = 1540842240. Its totient is φ = 205516224.

The previous prime is 638328577. The next prime is 638328589. The reversal of 638328588 is 885823836.

It is a self number, because there is not a number n which added to its sum of digits gives 638328588.

It is not an unprimeable number, because it can be changed into a prime (638328589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56545 + ... + 66887.

It is an arithmetic number, because the mean of its divisors is an integer number (32100880).

Almost surely, 2^638328588 is an apocalyptic number.

It is an amenable number.

638328588 is an abundant number, since it is smaller than the sum of its proper divisors (902513652).

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

638328588 is a wasteful number, since it uses less digits than its factorization.

638328588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526 (or 10524 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 51.

The square root of 638328588 is about 25265.1655050981. The cubic root of 638328588 is about 861.0230244976.

The spelling of 638328588 in words is "six hundred thirty-eight million, three hundred twenty-eight thousand, five hundred eighty-eight".