72272173 has 4 divisors (see below), whose sum is σ = 72582588. Its totient is φ = 71961760.

The previous prime is 72272153. The next prime is 72272197. The reversal of 72272173 is 37127227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37127227 = 47 ⋅789941.

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 59182249 = 3618^2 + 7693^2 .

It is a cyclic number.

It is not a de Polignac number, because 72272173 - 2²⁵ = 38717741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72272153) 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 3 ways as a sum of consecutive naturals, for example, 154858 + ... + 155323.

It is an arithmetic number, because the mean of its divisors is an integer number (18145647).

Almost surely, 2^72272173 is an apocalyptic number.

It is an amenable number.

72272173 is a deficient number, since it is larger than the sum of its proper divisors (310415).

72272173 is a wasteful number, since it uses less digits than its factorization.

72272173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310414.

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

The square root of 72272173 is about 8501.3041940634. The cubic root of 72272173 is about 416.5403116242.

The spelling of 72272173 in words is "seventy-two million, two hundred seventy-two thousand, one hundred seventy-three".