638352028472 has 64 divisors (see below), whose sum is σ = 1235256548640. Its totient is φ = 309115699200.

The previous prime is 638352028471. The next prime is 638352028493. The reversal of 638352028472 is 274820253836.

638352028472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 638352028472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638352028471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120874472 + ... + 120879752.

Almost surely, 2^638352028472 is an apocalyptic number.

It is an amenable number.

638352028472 is a deficient number, since it is larger than the sum of its proper divisors (596904520168).

638352028472 is a wasteful number, since it uses less digits than its factorization.

638352028472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9112 (or 9108 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 638352028472 in words is "six hundred thirty-eight billion, three hundred fifty-two million, twenty-eight thousand, four hundred seventy-two".