638927568162 has 192 divisors, whose sum is σ = 1556969621760. Its totient is φ = 194108368896.

The previous prime is 638927568137. The next prime is 638927568173. The reversal of 638927568162 is 261865729836.

It is a happy number.

638927568162 is a `hidden beast` number, since 6 + 3 + 8 + 9 + 2 + 7 + 568 + 1 + 62 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 638927568162.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 728537268 + ... + 728538144.

It is an arithmetic number, because the mean of its divisors is an integer number (8109216780).

Almost surely, 2^638927568162 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638927568162, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778484810880).

638927568162 is an abundant number, since it is smaller than the sum of its proper divisors (918042053598).

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

638927568162 is a wasteful number, since it uses less digits than its factorization.

638927568162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834 (or 1815 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 638927568162 in words is "six hundred thirty-eight billion, nine hundred twenty-seven million, five hundred sixty-eight thousand, one hundred sixty-two".