638367621060 has 48 divisors (see below), whose sum is σ = 1924923905856. Its totient is φ = 157136644992.

The previous prime is 638367621053. The next prime is 638367621097. The reversal of 638367621060 is 60126763836.

It is a happy number.

638367621060 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409209234 + ... + 409210793.

It is an arithmetic number, because the mean of its divisors is an integer number (40102581372).

Almost surely, 2^638367621060 is an apocalyptic number.

638367621060 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638367621060 is an abundant number, since it is smaller than the sum of its proper divisors (1286556284796).

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

638367621060 is a wasteful number, since it uses less digits than its factorization.

638367621060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818420052 (or 818420050 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 638367621060 in words is "six hundred thirty-eight billion, three hundred sixty-seven million, six hundred twenty-one thousand, sixty".