72173227 has 12 divisors (see below), whose sum is σ = 85543776. Its totient is φ = 60693360.

The previous prime is 72173219. The next prime is 72173251. The reversal of 72173227 is 72237127.

It is not a de Polignac number, because 72173227 - 2³ = 72173219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72173327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11299 + ... + 16492.

It is an arithmetic number, because the mean of its divisors is an integer number (7128648).

Almost surely, 2^72173227 is an apocalyptic number.

72173227 is a deficient number, since it is larger than the sum of its proper divisors (13370549).

72173227 is a wasteful number, since it uses less digits than its factorization.

72173227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27858 (or 27851 counting only the distinct ones).

The product of its digits is 8232, while the sum is 31.

The square root of 72173227 is about 8495.4827408453. The cubic root of 72173227 is about 416.3501332144.

The spelling of 72173227 in words is "seventy-two million, one hundred seventy-three thousand, two hundred twenty-seven".