22128388 has 24 divisors (see below), whose sum is σ = 40914720. Its totient is φ = 10442880.

The previous prime is 22128371. The next prime is 22128409. The reversal of 22128388 is 88382122.

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, 37020 + ... + 37612.

It is an arithmetic number, because the mean of its divisors is an integer number (1704780).

Almost surely, 2^22128388 is an apocalyptic number.

It is an amenable number.

22128388 is a deficient number, since it is larger than the sum of its proper divisors (18786332).

22128388 is a wasteful number, since it uses less digits than its factorization.

22128388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1105 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 22128388 is about 4704.0820571074. The cubic root of 22128388 is about 280.7479492432.

The spelling of 22128388 in words is "twenty-two million, one hundred twenty-eight thousand, three hundred eighty-eight".