22128930 has 64 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 5754240.

The previous prime is 22128929. The next prime is 22128937. The reversal of 22128930 is 3982122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22128894 and 22128903.

It is not an unprimeable number, because it can be changed into a prime (22128937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10071 + ... + 12069.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^22128930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22128930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

22128930 is an abundant number, since it is smaller than the sum of its proper divisors (38351070).

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

22128930 is a wasteful number, since it uses less digits than its factorization.

22128930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2050 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 22128930 is about 4704.1396662939. The cubic root of 22128930 is about 280.7502413840.

The spelling of 22128930 in words is "twenty-two million, one hundred twenty-eight thousand, nine hundred thirty".