72172809690 has 16 divisors (see below), whose sum is σ = 173214743328. Its totient is φ = 19246082576.

The previous prime is 72172809679. The next prime is 72172809691. The reversal of 72172809690 is 9690827127.

It is a super-2 number, since 2×72172809690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72172809691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1202880132 + ... + 1202880191.

It is an arithmetic number, because the mean of its divisors is an integer number (10825921458).

Almost surely, 2^72172809690 is an apocalyptic number.

72172809690 is an abundant number, since it is smaller than the sum of its proper divisors (101041933638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72172809690 is a wasteful number, since it uses less digits than its factorization.

72172809690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405760333.

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 72172809690 in words is "seventy-two billion, one hundred seventy-two million, eight hundred nine thousand, six hundred ninety".