78876688815 has 32 divisors (see below), whose sum is σ = 141613617600. Its totient is φ = 41651049600.

The previous prime is 78876688811. The next prime is 78876688903. The reversal of 78876688815 is 51888667887.

It is not a de Polignac number, because 78876688815 - 2² = 78876688811 is a prime.

It is a super-2 number, since 2×78876688815² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78876688811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2878800 + ... + 2906069.

It is an arithmetic number, because the mean of its divisors is an integer number (4425425550).

Almost surely, 2^78876688815 is an apocalyptic number.

78876688815 is a deficient number, since it is larger than the sum of its proper divisors (62736928785).

78876688815 is a wasteful number, since it uses less digits than its factorization.

78876688815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784984 (or 5784978 counting only the distinct ones).

The product of its digits is 289013760, while the sum is 72.

The spelling of 78876688815 in words is "seventy-eight billion, eight hundred seventy-six million, six hundred eighty-eight thousand, eight hundred fifteen".