22128730 has 96 divisors (see below), whose sum is σ = 49512960. Its totient is φ = 7050240.

The previous prime is 22128727. The next prime is 22128731. The reversal of 22128730 is 3782122.

It is a junction number, because it is equal to n+sod(n) for n = 22128695 and 22128704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22128731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 713815 + ... + 713845.

It is an arithmetic number, because the mean of its divisors is an integer number (515760).

Almost surely, 2^22128730 is an apocalyptic number.

22128730 is an abundant number, since it is smaller than the sum of its proper divisors (27384230).

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

22128730 is a wasteful number, since it uses less digits than its factorization.

22128730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 22128730 is about 4704.1184083737. The cubic root of 22128730 is about 280.7493955800.

The spelling of 22128730 in words is "twenty-two million, one hundred twenty-eight thousand, seven hundred thirty".