78316793891 has 16 divisors (see below), whose sum is σ = 89773944000. Its totient is φ = 66927057408.

The previous prime is 78316793879. The next prime is 78316793897. The reversal of 78316793891 is 19839761387.

It is a cyclic number.

It is not a de Polignac number, because 78316793891 - 2²² = 78312599587 is a prime.

It is a super-2 number, since 2×78316793891² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78316793897) 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, 8297711 + ... + 8307143.

It is an arithmetic number, because the mean of its divisors is an integer number (5610871500).

Almost surely, 2^78316793891 is an apocalyptic number.

78316793891 is a deficient number, since it is larger than the sum of its proper divisors (11457150109).

78316793891 is a wasteful number, since it uses less digits than its factorization.

78316793891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12878.

The product of its digits is 13716864, while the sum is 62.

The spelling of 78316793891 in words is "seventy-eight billion, three hundred sixteen million, seven hundred ninety-three thousand, eight hundred ninety-one".