638107268 has 24 divisors (see below), whose sum is σ = 1125764640. Its totient is φ = 316471680.

The previous prime is 638107259. The next prime is 638107273. The reversal of 638107268 is 862701836.

It is a happy number.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 271643 + ... + 273981.

It is an arithmetic number, because the mean of its divisors is an integer number (46906860).

Almost surely, 2^638107268 is an apocalyptic number.

It is an amenable number.

638107268 is a deficient number, since it is larger than the sum of its proper divisors (487657372).

638107268 is a wasteful number, since it uses less digits than its factorization.

638107268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867 (or 2865 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 638107268 is about 25260.7851817793. The cubic root of 638107268 is about 860.9235022727.

The spelling of 638107268 in words is "six hundred thirty-eight million, one hundred seven thousand, two hundred sixty-eight".