638133484 has 12 divisors (see below), whose sum is σ = 1118547864. Its totient is φ = 318548384.

The previous prime is 638133479. The next prime is 638133493. The reversal of 638133484 is 484331836.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126814 + ... + 131749.

It is an arithmetic number, because the mean of its divisors is an integer number (93212322).

Almost surely, 2^638133484 is an apocalyptic number.

It is an amenable number.

638133484 is a deficient number, since it is larger than the sum of its proper divisors (480414380).

638133484 is a wasteful number, since it uses less digits than its factorization.

638133484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259184 (or 259182 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 638133484 is about 25261.3040835187. The cubic root of 638133484 is about 860.9352921721.

The spelling of 638133484 in words is "six hundred thirty-eight million, one hundred thirty-three thousand, four hundred eighty-four".