22657728 has 56 divisors (see below), whose sum is σ = 63113920. Its totient is φ = 7153920.

The previous prime is 22657697. The next prime is 22657751. The reversal of 22657728 is 82775622.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543 + ... + 6753.

Almost surely, 2^22657728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22657728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31556960).

22657728 is an abundant number, since it is smaller than the sum of its proper divisors (40456192).

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

22657728 is a wasteful number, since it uses less digits than its factorization.

22657728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6245 (or 6235 counting only the distinct ones).

The product of its digits is 94080, while the sum is 39.

The square root of 22657728 is about 4760.0134453592. The cubic root of 22657728 is about 282.9689519643.

The spelling of 22657728 in words is "twenty-two million, six hundred fifty-seven thousand, seven hundred twenty-eight".