222728 has 16 divisors (see below), whose sum is σ = 455760. Its totient is φ = 101200.

The previous prime is 222713. The next prime is 222731. The reversal of 222728 is 827222.

It is a happy number.

It is an Ulam number.

It is an unprimeable number.

222728 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178 + ... + 1353.

It is an arithmetic number, because the mean of its divisors is an integer number (28485).

2²²²⁷²⁸ is an apocalyptic number.

It is an amenable number.

222728 is an abundant number, since it is smaller than the sum of its proper divisors (233032).

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

222728 is a wasteful number, since it uses less digits than its factorization.

222728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548 (or 2544 counting only the distinct ones).

The product of its digits is 896, while the sum is 23.

The square root of 222728 is about 471.9406742378. The cubic root of 222728 is about 60.6166045695.

The spelling of 222728 in words is "two hundred twenty-two thousand, seven hundred twenty-eight".