7172228 has 72 divisors (see below), whose sum is σ = 16011072. Its totient is φ = 2794176.

The previous prime is 7172219. The next prime is 7172237. The reversal of 7172228 is 8222717.

It is an interprime number because it is at equal distance from previous prime (7172219) and next prime (7172237).

Its product of digits (3136) is a multiple of the sum of its prime divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 7172228.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166775 + ... + 166817.

It is an arithmetic number, because the mean of its divisors is an integer number (222376).

Almost surely, 2^7172228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7172228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8005536).

7172228 is an abundant number, since it is smaller than the sum of its proper divisors (8838844).

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

7172228 is a wasteful number, since it uses less digits than its factorization.

7172228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 112 counting only the distinct ones).

The product of its digits is 3136, while the sum is 29.

The square root of 7172228 is about 2678.1015664086. The cubic root of 7172228 is about 192.8492832123.

The spelling of 7172228 in words is "seven million, one hundred seventy-two thousand, two hundred twenty-eight".