638448712 has 16 divisors (see below), whose sum is σ = 1305918000. Its totient is φ = 290203920.

The previous prime is 638448703. The next prime is 638448731. The reversal of 638448712 is 217844836.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3627462 + ... + 3627637.

It is an arithmetic number, because the mean of its divisors is an integer number (81619875).

Almost surely, 2^638448712 is an apocalyptic number.

It is an amenable number.

638448712 is an abundant number, since it is smaller than the sum of its proper divisors (667469288).

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

638448712 is a wasteful number, since it uses less digits than its factorization.

638448712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7255116 (or 7255112 counting only the distinct ones).

The product of its digits is 258048, while the sum is 43.

The square root of 638448712 is about 25267.5426585175. The cubic root of 638448712 is about 861.0770317098.

The spelling of 638448712 in words is "six hundred thirty-eight million, four hundred forty-eight thousand, seven hundred twelve".