638106634360 has 32 divisors (see below), whose sum is σ = 1546181461440. Its totient is φ = 235608603264.

The previous prime is 638106634237. The next prime is 638106634379. The reversal of 638106634360 is 63436601836.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 638106634360.

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, 613563552 + ... + 613564591.

It is an arithmetic number, because the mean of its divisors is an integer number (48318170670).

Almost surely, 2^638106634360 is an apocalyptic number.

It is an amenable number.

638106634360 is an abundant number, since it is smaller than the sum of its proper divisors (908074827080).

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

638106634360 is a wasteful number, since it uses less digits than its factorization.

638106634360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227128167 (or 1227128163 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 638106634360 in words is "six hundred thirty-eight billion, one hundred six million, six hundred thirty-four thousand, three hundred sixty".