78722858015 has 16 divisors (see below), whose sum is σ = 95378044320. Its totient is φ = 62371553280.

The previous prime is 78722857999. The next prime is 78722858017. The reversal of 78722858015 is 51085822787.

It is not a de Polignac number, because 78722858015 - 2⁴ = 78722857999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722858017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996895 + ... + 2035935.

It is an arithmetic number, because the mean of its divisors is an integer number (5961127770).

Almost surely, 2^78722858015 is an apocalyptic number.

78722858015 is a deficient number, since it is larger than the sum of its proper divisors (16655186305).

78722858015 is a wasteful number, since it uses less digits than its factorization.

78722858015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42922.

The product of its (nonzero) digits is 2508800, while the sum is 53.

The spelling of 78722858015 in words is "seventy-eight billion, seven hundred twenty-two million, eight hundred fifty-eight thousand, fifteen".