78972185715 has 16 divisors (see below), whose sum is σ = 126358983936. Its totient is φ = 42117336800.

The previous prime is 78972185701. The next prime is 78972185749. The reversal of 78972185715 is 51758127987.

It is not a de Polignac number, because 78972185715 - 2⁸ = 78972185459 is a prime.

It is a super-2 number, since 2×78972185715² (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 15 ways as a sum of consecutive naturals, for example, 999820 + ... + 1075910.

It is an arithmetic number, because the mean of its divisors is an integer number (7897436496).

Almost surely, 2^78972185715 is an apocalyptic number.

78972185715 is a deficient number, since it is larger than the sum of its proper divisors (47386798221).

78972185715 is a wasteful number, since it uses less digits than its factorization.

78972185715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145290.

The product of its digits is 9878400, while the sum is 60.

The spelling of 78972185715 in words is "seventy-eight billion, nine hundred seventy-two million, one hundred eighty-five thousand, seven hundred fifteen".