22755728 has 20 divisors (see below), whose sum is σ = 44349468. Its totient is φ = 11310720.

The previous prime is 22755721. The next prime is 22755731. The reversal of 22755728 is 82755722.

It can be written as a sum of positive squares in 2 ways, for example, as 21086464 + 1669264 = 4592^2 + 1292^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22755691 and 22755700.

It is not an unprimeable number, because it can be changed into a prime (22755721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343 + ... + 6878.

Almost surely, 2^22755728 is an apocalyptic number.

It is an amenable number.

22755728 is a deficient number, since it is larger than the sum of its proper divisors (21593740).

22755728 is a wasteful number, since it uses less digits than its factorization.

22755728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8402 (or 8396 counting only the distinct ones).

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

The square root of 22755728 is about 4770.2964268481. The cubic root of 22755728 is about 283.3763342655.

It can be divided in two parts, 227 and 55728, that added together give a palindrome (55955).

The spelling of 22755728 in words is "twenty-two million, seven hundred fifty-five thousand, seven hundred twenty-eight".