638283688 has 32 divisors (see below), whose sum is σ = 1396857600. Its totient is φ = 267728832.

The previous prime is 638283661. The next prime is 638283697. The reversal of 638283688 is 886382836.

638283688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 118623 + ... + 123886.

It is an arithmetic number, because the mean of its divisors is an integer number (43651800).

Almost surely, 2^638283688 is an apocalyptic number.

It is an amenable number.

638283688 is an abundant number, since it is smaller than the sum of its proper divisors (758573912).

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

638283688 is a wasteful number, since it uses less digits than its factorization.

638283688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242569 (or 242565 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The square root of 638283688 is about 25264.2769142519. The cubic root of 638283688 is about 861.0028359191.

The spelling of 638283688 in words is "six hundred thirty-eight million, two hundred eighty-three thousand, six hundred eighty-eight".