638048904 has 32 divisors (see below), whose sum is σ = 1601024640. Its totient is φ = 211896000.

The previous prime is 638048903. The next prime is 638048909. The reversal of 638048904 is 409840836.

It is not an unprimeable number, because it can be changed into a prime (638048903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42547 + ... + 55554.

It is an arithmetic number, because the mean of its divisors is an integer number (50032020).

Almost surely, 2^638048904 is an apocalyptic number.

It is an amenable number.

638048904 is an abundant number, since it is smaller than the sum of its proper divisors (962975736).

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

638048904 is a wasteful number, since it uses less digits than its factorization.

638048904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98381 (or 98377 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 638048904 is about 25259.6299260302. The cubic root of 638048904 is about 860.8972535662.

The spelling of 638048904 in words is "six hundred thirty-eight million, forty-eight thousand, nine hundred four".