22731228 has 36 divisors (see below), whose sum is σ = 61880728. Its totient is φ = 6994080.

The previous prime is 22731217. The next prime is 22731229. The reversal of 22731228 is 82213722.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22731229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23818 + ... + 24753.

Almost surely, 2^22731228 is an apocalyptic number.

It is an amenable number.

22731228 is an abundant number, since it is smaller than the sum of its proper divisors (39149500).

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

22731228 is a wasteful number, since it uses less digits than its factorization.

22731228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48594 (or 48589 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22731228 is about 4767.7277606843. The cubic root of 22731228 is about 283.2745985133.

The spelling of 22731228 in words is "twenty-two million, seven hundred thirty-one thousand, two hundred twenty-eight".