638373472 has 24 divisors (see below), whose sum is σ = 1371052872. Its totient is φ = 290169600.

The previous prime is 638373467. The next prime is 638373473. The reversal of 638373472 is 274373836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638373473) 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, 906429 + ... + 907132.

It is an arithmetic number, because the mean of its divisors is an integer number (57127203).

Almost surely, 2^638373472 is an apocalyptic number.

It is an amenable number.

638373472 is an abundant number, since it is smaller than the sum of its proper divisors (732679400).

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

638373472 is a wasteful number, since it uses less digits than its factorization.

638373472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813582 (or 1813574 counting only the distinct ones).

The product of its digits is 508032, while the sum is 43.

The square root of 638373472 is about 25266.0537480628. The cubic root of 638373472 is about 861.0432049357.

The spelling of 638373472 in words is "six hundred thirty-eight million, three hundred seventy-three thousand, four hundred seventy-two".