78312637823 has 32 divisors (see below), whose sum is σ = 95291596800. Its totient is φ = 62924287104.

The previous prime is 78312637789. The next prime is 78312637861. The reversal of 78312637823 is 32873621387.

It is not a de Polignac number, because 78312637823 - 2⁶ = 78312637759 is a prime.

It is a super-2 number, since 2×78312637823² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78312637723) 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, 3586886 + ... + 3608652.

It is an arithmetic number, because the mean of its divisors is an integer number (2977862400).

Almost surely, 2^78312637823 is an apocalyptic number.

78312637823 is a deficient number, since it is larger than the sum of its proper divisors (16978958977).

78312637823 is a wasteful number, since it uses less digits than its factorization.

78312637823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22319.

The product of its digits is 2032128, while the sum is 50.

The spelling of 78312637823 in words is "seventy-eight billion, three hundred twelve million, six hundred thirty-seven thousand, eight hundred twenty-three".