22815128 has 32 divisors (see below), whose sum is σ = 49568160. Its totient is φ = 9642240.

The previous prime is 22815097. The next prime is 22815137. The reversal of 22815128 is 82151822.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22815128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1298 + ... + 6878.

It is an arithmetic number, because the mean of its divisors is an integer number (1549005).

Almost surely, 2^22815128 is an apocalyptic number.

22815128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22815128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24784080).

22815128 is an abundant number, since it is smaller than the sum of its proper divisors (26753032).

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

22815128 is a wasteful number, since it uses less digits than its factorization.

22815128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5667 (or 5663 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 22815128 is about 4776.5183973267. The cubic root of 22815128 is about 283.6226887845.

The spelling of 22815128 in words is "twenty-two million, eight hundred fifteen thousand, one hundred twenty-eight".