77908122538 has 32 divisors (see below), whose sum is σ = 123615613440. Its totient is φ = 36723248640.

The previous prime is 77908122493. The next prime is 77908122541. The reversal of 77908122538 is 83522180977.

It is a super-2 number, since 2×77908122538² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 17517031 + ... + 17521477.

It is an arithmetic number, because the mean of its divisors is an integer number (3862987920).

Almost surely, 2^77908122538 is an apocalyptic number.

77908122538 is a deficient number, since it is larger than the sum of its proper divisors (45707490902).

77908122538 is a wasteful number, since it uses less digits than its factorization.

77908122538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 77908122538 in words is "seventy-seven billion, nine hundred eight million, one hundred twenty-two thousand, five hundred thirty-eight".