9221728 has 12 divisors (see below), whose sum is σ = 18155340. Its totient is φ = 4610848.

The previous prime is 9221717. The next prime is 9221741. The reversal of 9221728 is 8271229.

It is a self number, because there is not a number n which added to its sum of digits gives 9221728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 144058 + ... + 144121.

It is an arithmetic number, because the mean of its divisors is an integer number (1512945).

Almost surely, 2^9221728 is an apocalyptic number.

It is an amenable number.

9221728 is a deficient number, since it is larger than the sum of its proper divisors (8933612).

9221728 is a wasteful number, since it uses less digits than its factorization.

9221728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288189 (or 288181 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 9221728 is about 3036.7298200531. The cubic root of 9221728 is about 209.7027389028.

The spelling of 9221728 in words is "nine million, two hundred twenty-one thousand, seven hundred twenty-eight".