638840760232 has 16 divisors (see below), whose sum is σ = 1199408770260. Its totient is φ = 318998421504.

The previous prime is 638840760223. The next prime is 638840760253. The reversal of 638840760232 is 232067048836.

It is a happy number.

638840760232 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 583307952516 + 55532807716 = 763746^2 + 235654^2 .

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, 52738393 + ... + 52750504.

Almost surely, 2^638840760232 is an apocalyptic number.

It is an amenable number.

638840760232 is a deficient number, since it is larger than the sum of its proper divisors (560568010028).

638840760232 is a wasteful number, since it uses less digits than its factorization.

638840760232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105489660 (or 105489656 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 638840760232 in words is "six hundred thirty-eight billion, eight hundred forty million, seven hundred sixty thousand, two hundred thirty-two".