22564728 has 24 divisors (see below), whose sum is σ = 61113000. Its totient is φ = 7521552.

The previous prime is 22564699. The next prime is 22564741. The reversal of 22564728 is 82746522.

22564728 is a `hidden beast` number, since 2 + 2 + 5 + 647 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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 = 22564692 and 22564701.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156628 + ... + 156771.

It is an arithmetic number, because the mean of its divisors is an integer number (2546375).

Almost surely, 2^22564728 is an apocalyptic number.

It is an amenable number.

22564728 is an abundant number, since it is smaller than the sum of its proper divisors (38548272).

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

22564728 is a wasteful number, since it uses less digits than its factorization.

22564728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313411 (or 313404 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 22564728 is about 4750.2345205263. The cubic root of 22564728 is about 282.5812667234.

The spelling of 22564728 in words is "twenty-two million, five hundred sixty-four thousand, seven hundred twenty-eight".