22189428 has 72 divisors (see below), whose sum is σ = 59055360. Its totient is φ = 7015680.

The previous prime is 22189423. The next prime is 22189439. The reversal of 22189428 is 82498122.

22189428 is a `hidden beast` number, since 221 + 8 + 9 + 428 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 22189392 and 22189401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22189423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65676 + ... + 66012.

Almost surely, 2^22189428 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 22189428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29527680).

22189428 is an abundant number, since it is smaller than the sum of its proper divisors (36865932).

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

22189428 is a wasteful number, since it uses less digits than its factorization.

22189428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 432 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 22189428 is about 4710.5655711390. The cubic root of 22189428 is about 281.0058550892.

The spelling of 22189428 in words is "twenty-two million, one hundred eighty-nine thousand, four hundred twenty-eight".