72864442865 has 32 divisors (see below), whose sum is σ = 93393616896. Its totient is φ = 54445842880.

The previous prime is 72864442837. The next prime is 72864442867. The reversal of 72864442865 is 56824446827.

It is a de Polignac number, because none of the positive numbers 2^k-72864442865 is a prime.

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 72864442865.

It is not an unprimeable number, because it can be changed into a prime (72864442867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2379200 + ... + 2409630.

It is an arithmetic number, because the mean of its divisors is an integer number (2918550528).

Almost surely, 2^72864442865 is an apocalyptic number.

It is an amenable number.

72864442865 is a deficient number, since it is larger than the sum of its proper divisors (20529174031).

72864442865 is a wasteful number, since it uses less digits than its factorization.

72864442865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30949.

The product of its digits is 20643840, while the sum is 56.

The spelling of 72864442865 in words is "seventy-two billion, eight hundred sixty-four million, four hundred forty-two thousand, eight hundred sixty-five".