22915728 has 240 divisors, whose sum is σ = 79387776. Its totient is φ = 6082560.

The previous prime is 22915723. The next prime is 22915733. The reversal of 22915728 is 82751922.

It is an interprime number because it is at equal distance from previous prime (22915723) and next prime (22915733).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22915692 and 22915701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22915721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 619326 + ... + 619362.

Almost surely, 2^22915728 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 22915728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39693888).

22915728 is an abundant number, since it is smaller than the sum of its proper divisors (56472048).

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

22915728 is a wasteful number, since it uses less digits than its factorization.

22915728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 93 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22915728 is about 4787.0374972419. The cubic root of 22915728 is about 284.0389419589.

The spelling of 22915728 in words is "twenty-two million, nine hundred fifteen thousand, seven hundred twenty-eight".