22404728 has 16 divisors (see below), whose sum is σ = 42140760. Its totient is φ = 11167200.

The previous prime is 22404727. The next prime is 22404731. The reversal of 22404728 is 82740422.

It is a self number, because there is not a number n which added to its sum of digits gives 22404728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22404727) 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, 1583 + ... + 6878.

Almost surely, 2^22404728 is an apocalyptic number.

It is an amenable number.

22404728 is a deficient number, since it is larger than the sum of its proper divisors (19736032).

22404728 is a wasteful number, since it uses less digits than its factorization.

22404728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8798 (or 8794 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 22404728 is about 4733.3632862902. The cubic root of 22404728 is about 281.9117809995.

It can be divided in two parts, 22404 and 728, that added together give a palindrome (23132).

The spelling of 22404728 in words is "twenty-two million, four hundred four thousand, seven hundred twenty-eight".