72173109 has 16 divisors (see below), whose sum is σ = 102634560. Its totient is φ = 44954880.

The previous prime is 72173099. The next prime is 72173131. The reversal of 72173109 is 90137127.

It is not a de Polignac number, because 72173109 - 2⁸ = 72172853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173209) 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, 1999 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (6414660).

Almost surely, 2^72173109 is an apocalyptic number.

It is an amenable number.

72173109 is a deficient number, since it is larger than the sum of its proper divisors (30461451).

72173109 is a wasteful number, since it uses less digits than its factorization.

72173109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10340.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 72173109 is about 8495.4757959752. The cubic root of 72173109 is about 416.3499063097.

The spelling of 72173109 in words is "seventy-two million, one hundred seventy-three thousand, one hundred nine".