72381294723 has 18 divisors (see below), whose sum is σ = 102530517796. Its totient is φ = 45410743808.

The previous prime is 72381294719. The next prime is 72381294737. The reversal of 72381294723 is 32749218327.

It is not a de Polignac number, because 72381294723 - 2² = 72381294719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72381292723) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7917211 + ... + 7926347.

Almost surely, 2^72381294723 is an apocalyptic number.

72381294723 is a deficient number, since it is larger than the sum of its proper divisors (30149223073).

72381294723 is an frugal number, since it uses more digits than its factorization.

72381294723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18311 (or 9157 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

Multiplying 72381294723 by its sum of digits (48), we get a square (3474302146704 = 1863948²).

The spelling of 72381294723 in words is "seventy-two billion, three hundred eighty-one million, two hundred ninety-four thousand, seven hundred twenty-three".