638474488 has 16 divisors (see below), whose sum is σ = 1198136880. Its totient is φ = 318971328.

The previous prime is 638474483. The next prime is 638474489. The reversal of 638474488 is 884474836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638474483) 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, 22845 + ... + 42412.

It is an arithmetic number, because the mean of its divisors is an integer number (74883555).

Almost surely, 2^638474488 is an apocalyptic number.

It is an amenable number.

638474488 is a deficient number, since it is larger than the sum of its proper divisors (559662392).

638474488 is a wasteful number, since it uses less digits than its factorization.

638474488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66486 (or 66482 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 52.

The square root of 638474488 is about 25268.0527148413. The cubic root of 638474488 is about 861.0886196011.

The spelling of 638474488 in words is "six hundred thirty-eight million, four hundred seventy-four thousand, four hundred eighty-eight".