7215228 has 72 divisors (see below), whose sum is σ = 19219200. Its totient is φ = 2280096.

The previous prime is 7215227. The next prime is 7215239. The reversal of 7215228 is 8225127.

7215228 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7215223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91293 + ... + 91371.

Almost surely, 2^7215228 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 7215228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9609600).

7215228 is an abundant number, since it is smaller than the sum of its proper divisors (12003972).

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

7215228 is a wasteful number, since it uses less digits than its factorization.

7215228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 186 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 7215228 is about 2686.1176444825. The cubic root of 7215228 is about 193.2339150625.

The spelling of 7215228 in words is "seven million, two hundred fifteen thousand, two hundred twenty-eight".