22555728 has 60 divisors (see below), whose sum is σ = 67986100. Its totient is φ = 6939648.

The previous prime is 22555727. The next prime is 22555739. The reversal of 22555728 is 82755522.

It can be written as a sum of positive squares in 2 ways, for example, as 9072144 + 13483584 = 3012^2 + 3672^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22555692 and 22555701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22555721) 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, 4153 + ... + 7896.

Almost surely, 2^22555728 is an apocalyptic number.

It is an amenable number.

22555728 is an abundant number, since it is smaller than the sum of its proper divisors (45430372).

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

22555728 is a wasteful number, since it uses less digits than its factorization.

22555728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12076 (or 12067 counting only the distinct ones).

The product of its digits is 56000, while the sum is 36.

The square root of 22555728 is about 4749.2871043979. The cubic root of 22555728 is about 282.5436923049.

The spelling of 22555728 in words is "twenty-two million, five hundred fifty-five thousand, seven hundred twenty-eight".