78108387172 has 12 divisors (see below), whose sum is σ = 137943712060. Its totient is φ = 38695898016.

The previous prime is 78108387163. The next prime is 78108387191. The reversal of 78108387172 is 27178380187.

It can be written as a sum of positive squares in 2 ways, for example, as 55176130816 + 22932256356 = 234896^2 + 151434^2 .

It is a super-2 number, since 2×78108387172² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89573403 + ... + 89574274.

Almost surely, 2^78108387172 is an apocalyptic number.

It is an amenable number.

78108387172 is a deficient number, since it is larger than the sum of its proper divisors (59835324888).

78108387172 is a wasteful number, since it uses less digits than its factorization.

78108387172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179147790 (or 179147788 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 52.

The spelling of 78108387172 in words is "seventy-eight billion, one hundred eight million, three hundred eighty-seven thousand, one hundred seventy-two".