22865728 has 28 divisors (see below), whose sum is σ = 46125892. Its totient is φ = 11243520.

The previous prime is 22865719. The next prime is 22865729. The reversal of 22865728 is 82756822.

It can be written as a sum of positive squares in 2 ways, for example, as 10810944 + 12054784 = 3288^2 + 3472^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22865729) 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, 976 + ... + 6832.

Almost surely, 2^22865728 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 22865728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23062946).

22865728 is an abundant number, since it is smaller than the sum of its proper divisors (23260164).

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

22865728 is an equidigital number, since it uses as much as digits as its factorization.

22865728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5930 (or 5920 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 22865728 is about 4781.8122087761. The cubic root of 22865728 is about 283.8322092911.

It can be divided in two parts, 228 and 65728, that added together give a palindrome (65956).

The spelling of 22865728 in words is "twenty-two million, eight hundred sixty-five thousand, seven hundred twenty-eight".