7257228 has 24 divisors (see below), whose sum is σ = 18473280. Its totient is φ = 2199120.

The previous prime is 7257227. The next prime is 7257241. The reversal of 7257228 is 8227527.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (7257227) 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 7 ways as a sum of consecutive naturals, for example, 27358 + ... + 27621.

It is an arithmetic number, because the mean of its divisors is an integer number (769720).

Almost surely, 2^7257228 is an apocalyptic number.

It is an amenable number.

7257228 is an abundant number, since it is smaller than the sum of its proper divisors (11216052).

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

7257228 is a wasteful number, since it uses less digits than its factorization.

7257228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54997 (or 54995 counting only the distinct ones).

The product of its digits is 15680, while the sum is 33.

The square root of 7257228 is about 2693.9242751050. The cubic root of 7257228 is about 193.6081295109.

Subtracting 7257228 from its reverse (8227527), we obtain a cube (970299 = 99³).

The spelling of 7257228 in words is "seven million, two hundred fifty-seven thousand, two hundred twenty-eight".