22745728 has 32 divisors (see below), whose sum is σ = 47983860. Its totient is φ = 10702848.

The previous prime is 22745719. The next prime is 22745729. The reversal of 22745728 is 82754722.

It can be written as a sum of positive squares in 2 ways, for example, as 18045504 + 4700224 = 4248^2 + 2168^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (22745729) 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, 3051 + ... + 7402.

Almost surely, 2^22745728 is an apocalyptic number.

It is an amenable number.

22745728 is an abundant number, since it is smaller than the sum of its proper divisors (25238132).

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

22745728 is a wasteful number, since it uses less digits than its factorization.

22745728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10484 (or 10472 counting only the distinct ones).

The product of its digits is 62720, while the sum is 37.

The square root of 22745728 is about 4769.2481587772. The cubic root of 22745728 is about 283.3348182929.

The spelling of 22745728 in words is "twenty-two million, seven hundred forty-five thousand, seven hundred twenty-eight".