72172688109 has 8 divisors (see below), whose sum is σ = 96452493312. Its totient is φ = 48004004160.

The previous prime is 72172688087. The next prime is 72172688111. The reversal of 72172688109 is 90188627127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72172688109 - 2²¹ = 72170590957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72172688179) 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, 27778797 + ... + 27781394.

It is an arithmetic number, because the mean of its divisors is an integer number (12056561664).

Almost surely, 2^72172688109 is an apocalyptic number.

It is an amenable number.

72172688109 is a deficient number, since it is larger than the sum of its proper divisors (24279805203).

72172688109 is a wasteful number, since it uses less digits than its factorization.

72172688109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55560627.

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 72172688109 in words is "seventy-two billion, one hundred seventy-two million, six hundred eighty-eight thousand, one hundred nine".