7216228 has 12 divisors (see below), whose sum is σ = 13371372. Its totient is φ = 3395840.

The previous prime is 7216213. The next prime is 7216241. The reversal of 7216228 is 8226127.

It can be written as a sum of positive squares in 2 ways, for example, as 5943844 + 1272384 = 2438^2 + 1128^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7216196 and 7216205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52993 + ... + 53128.

It is an arithmetic number, because the mean of its divisors is an integer number (1114281).

Almost surely, 2^7216228 is an apocalyptic number.

It is an amenable number.

7216228 is a deficient number, since it is larger than the sum of its proper divisors (6155144).

7216228 is a wasteful number, since it uses less digits than its factorization.

7216228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106142 (or 106140 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 7216228 is about 2686.3037802899. The cubic root of 7216228 is about 193.2428417838.

The spelling of 7216228 in words is "seven million, two hundred sixteen thousand, two hundred twenty-eight".