22128745 has 4 divisors (see below), whose sum is σ = 26554500. Its totient is φ = 17702992.

The previous prime is 22128739. The next prime is 22128767. The reversal of 22128745 is 54782122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2742336 + 19386409 = 1656^2 + 4403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22128745 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2212870 + ... + 2212879.

It is an arithmetic number, because the mean of its divisors is an integer number (6638625).

Almost surely, 2^22128745 is an apocalyptic number.

It is an amenable number.

22128745 is a deficient number, since it is larger than the sum of its proper divisors (4425755).

22128745 is an equidigital number, since it uses as much as digits as its factorization.

22128745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425754.

The product of its digits is 8960, while the sum is 31.

The square root of 22128745 is about 4704.1200027210. The cubic root of 22128745 is about 280.7494590154.

The spelling of 22128745 in words is "twenty-two million, one hundred twenty-eight thousand, seven hundred forty-five".