638768832 has 56 divisors (see below), whose sum is σ = 1820088816. Its totient is φ = 196543488.

The previous prime is 638768791. The next prime is 638768849. The reversal of 638768832 is 238867836.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125463 + ... + 130454.

It is an arithmetic number, because the mean of its divisors is an integer number (32501586).

Almost surely, 2^638768832 is an apocalyptic number.

It is an amenable number.

638768832 is an abundant number, since it is smaller than the sum of its proper divisors (1181319984).

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

638768832 is a wasteful number, since it uses less digits than its factorization.

638768832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255945 (or 255935 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The square root of 638768832 is about 25273.8764735448. The cubic root of 638768832 is about 861.2209231541.

The spelling of 638768832 in words is "six hundred thirty-eight million, seven hundred sixty-eight thousand, eight hundred thirty-two".