638900472 has 32 divisors (see below), whose sum is σ = 1825430400. Its totient is φ = 182542944.

The previous prime is 638900467. The next prime is 638900489. The reversal of 638900472 is 274009836.

It is a self number, because there is not a number n which added to its sum of digits gives 638900472.

It is a congruent number.

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, 1901322 + ... + 1901657.

It is an arithmetic number, because the mean of its divisors is an integer number (57044700).

Almost surely, 2^638900472 is an apocalyptic number.

It is an amenable number.

638900472 is an abundant number, since it is smaller than the sum of its proper divisors (1186529928).

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

638900472 is a wasteful number, since it uses less digits than its factorization.

638900472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802995 (or 3802991 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 638900472 is about 25276.4806094519. The cubic root of 638900472 is about 861.2800803586.

The spelling of 638900472 in words is "six hundred thirty-eight million, nine hundred thousand, four hundred seventy-two".