7223728 has 20 divisors (see below), whose sum is σ = 14039280. Its totient is φ = 3600704.

The previous prime is 7223719. The next prime is 7223729. The reversal of 7223728 is 8273227.

It is a self number, because there is not a number n which added to its sum of digits gives 7223728.

It is not an unprimeable number, because it can be changed into a prime (7223729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7701 + ... + 8587.

It is an arithmetic number, because the mean of its divisors is an integer number (701964).

Almost surely, 2^7223728 is an apocalyptic number.

It is an amenable number.

7223728 is a deficient number, since it is larger than the sum of its proper divisors (6815552).

7223728 is a wasteful number, since it uses less digits than its factorization.

7223728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1404 (or 1398 counting only the distinct ones).

The product of its digits is 9408, while the sum is 31.

The square root of 7223728 is about 2687.6993879525. The cubic root of 7223728 is about 193.3097659210.

The spelling of 7223728 in words is "seven million, two hundred twenty-three thousand, seven hundred twenty-eight".