72172277786 has 32 divisors (see below), whose sum is σ = 128186720640. Its totient is φ = 29818547136.

The previous prime is 72172277773. The next prime is 72172277789. The reversal of 72172277786 is 68777227127.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72172277789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129005 + ... + 401231.

It is an arithmetic number, because the mean of its divisors is an integer number (4005835020).

Almost surely, 2^72172277786 is an apocalyptic number.

72172277786 is a deficient number, since it is larger than the sum of its proper divisors (56014442854).

72172277786 is a wasteful number, since it uses less digits than its factorization.

72172277786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272918.

The product of its digits is 6453888, while the sum is 56.

The spelling of 72172277786 in words is "seventy-two billion, one hundred seventy-two million, two hundred seventy-seven thousand, seven hundred eighty-six".