22128988 has 36 divisors (see below), whose sum is σ = 45519600. Its totient is φ = 9409176.

The previous prime is 22128973. The next prime is 22128989. The reversal of 22128988 is 88982122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a self number, because there is not a number n which added to its sum of digits gives 22128988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22128989) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174181 + ... + 174307.

Almost surely, 2^22128988 is an apocalyptic number.

22128988 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 22128988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22759800).

22128988 is an abundant number, since it is smaller than the sum of its proper divisors (23390612).

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

22128988 is an equidigital number, since it uses as much as digits as its factorization.

22128988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 136 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 22128988 is about 4704.1458310728. The cubic root of 22128988 is about 280.7504866663.

The spelling of 22128988 in words is "twenty-two million, one hundred twenty-eight thousand, nine hundred eighty-eight".