72344591931 has 4 divisors (see below), whose sum is σ = 96459455912. Its totient is φ = 48229727952.

The previous prime is 72344591923. The next prime is 72344591933. The reversal of 72344591931 is 13919544327.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72344591931 - 2³ = 72344591923 is a prime.

It is a super-2 number, since 2×72344591931² (a number of 23 digits) contains 22 as substring.

It is the 268970-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72344591933) by changing a digit.

It is a nontrivial repunit in base 268969.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12057431986 + ... + 12057431991.

It is an arithmetic number, because the mean of its divisors is an integer number (24114863978).

Almost surely, 2^72344591931 is an apocalyptic number.

72344591931 is a deficient number, since it is larger than the sum of its proper divisors (24114863981).

72344591931 is a wasteful number, since it uses less digits than its factorization.

72344591931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24114863980.

The product of its digits is 816480, while the sum is 48.

The spelling of 72344591931 in words is "seventy-two billion, three hundred forty-four million, five hundred ninety-one thousand, nine hundred thirty-one".