72519732431 has 4 divisors (see below), whose sum is σ = 72590901000. Its totient is φ = 72448563864.

The previous prime is 72519732427. The next prime is 72519732443. The reversal of 72519732431 is 13423791527.

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

It is a cyclic number.

It is not a de Polignac number, because 72519732431 - 2² = 72519732427 is a prime.

It is a super-2 number, since 2×72519732431² (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 (72519762431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35582756 + ... + 35584793.

It is an arithmetic number, because the mean of its divisors is an integer number (18147725250).

Almost surely, 2^72519732431 is an apocalyptic number.

72519732431 is a deficient number, since it is larger than the sum of its proper divisors (71168569).

72519732431 is a wasteful number, since it uses less digits than its factorization.

72519732431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71168568.

The product of its digits is 317520, while the sum is 44.

The spelling of 72519732431 in words is "seventy-two billion, five hundred nineteen million, seven hundred thirty-two thousand, four hundred thirty-one".