68979462138 has 40 divisors (see below), whose sum is σ = 155349757332. Its totient is φ = 22876426944.

The previous prime is 68979462121. The next prime is 68979462151. The reversal of 68979462138 is 83126497986.

It can be written as a sum of positive squares in 2 ways, for example, as 46838914929 + 22140547209 = 216423^2 + 148797^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1048795 + ... + 1112622.

Almost surely, 2^68979462138 is an apocalyptic number.

68979462138 is an abundant number, since it is smaller than the sum of its proper divisors (86370295194).

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

68979462138 is a wasteful number, since it uses less digits than its factorization.

68979462138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161628 (or 2161619 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 68979462138 in words is "sixty-eight billion, nine hundred seventy-nine million, four hundred sixty-two thousand, one hundred thirty-eight".