22557728 has 12 divisors (see below), whose sum is σ = 44410590. Its totient is φ = 11278848.

The previous prime is 22557727. The next prime is 22557751. The reversal of 22557728 is 82775522.

It can be written as a sum of positive squares in only one way, i.e., 21049744 + 1507984 = 4588^2 + 1228^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22557691 and 22557700.

It is not an unprimeable number, because it can be changed into a prime (22557727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352433 + ... + 352496.

Almost surely, 2^22557728 is an apocalyptic number.

It is an amenable number.

22557728 is a deficient number, since it is larger than the sum of its proper divisors (21852862).

22557728 is an equidigital number, since it uses as much as digits as its factorization.

22557728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704939 (or 704931 counting only the distinct ones).

The product of its digits is 78400, while the sum is 38.

The square root of 22557728 is about 4749.4976576476. The cubic root of 22557728 is about 282.5520430393.

The spelling of 22557728 in words is "twenty-two million, five hundred fifty-seven thousand, seven hundred twenty-eight".