72644487715 has 16 divisors (see below), whose sum is σ = 90236119680. Its totient is φ = 56076289920.

The previous prime is 72644487709. The next prime is 72644487719. The reversal of 72644487715 is 51778444627.

It is a de Polignac number, because none of the positive numbers 2^k-72644487715 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72644487719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74710 + ... + 388420.

It is an arithmetic number, because the mean of its divisors is an integer number (5639757480).

Almost surely, 2^72644487715 is an apocalyptic number.

72644487715 is a deficient number, since it is larger than the sum of its proper divisors (17591631965).

72644487715 is a wasteful number, since it uses less digits than its factorization.

72644487715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315342.

The product of its digits is 10536960, while the sum is 55.

The spelling of 72644487715 in words is "seventy-two billion, six hundred forty-four million, four hundred eighty-seven thousand, seven hundred fifteen".