638582368 has 24 divisors (see below), whose sum is σ = 1258458768. Its totient is φ = 318973824.

The previous prime is 638582363. The next prime is 638582369. The reversal of 638582368 is 863285836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638582363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24630 + ... + 43402.

It is an arithmetic number, because the mean of its divisors is an integer number (52435782).

Almost surely, 2^638582368 is an apocalyptic number.

It is an amenable number.

638582368 is a deficient number, since it is larger than the sum of its proper divisors (619876400).

638582368 is a wasteful number, since it uses less digits than its factorization.

638582368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19846 (or 19838 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 49.

The square root of 638582368 is about 25270.1873360686. The cubic root of 638582368 is about 861.1371148871.

The spelling of 638582368 in words is "six hundred thirty-eight million, five hundred eighty-two thousand, three hundred sixty-eight".