78369313631 has 16 divisors (see below), whose sum is σ = 89755159104. Its totient is φ = 67031188224.

The previous prime is 78369313621. The next prime is 78369313643. The reversal of 78369313631 is 13631396387.

It is a de Polignac number, because none of the positive numbers 2^k-78369313631 is a prime.

It is a super-2 number, since 2×78369313631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78369313631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78369313621) 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, 6751925 + ... + 6763521.

It is an arithmetic number, because the mean of its divisors is an integer number (5609697444).

Almost surely, 2^78369313631 is an apocalyptic number.

78369313631 is a deficient number, since it is larger than the sum of its proper divisors (11385845473).

78369313631 is a wasteful number, since it uses less digits than its factorization.

78369313631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13570.

The product of its digits is 1469664, while the sum is 50.

The spelling of 78369313631 in words is "seventy-eight billion, three hundred sixty-nine million, three hundred thirteen thousand, six hundred thirty-one".