22128723 has 6 divisors (see below), whose sum is σ = 31963724. Its totient is φ = 14752476.

The previous prime is 22128721. The next prime is 22128727. The reversal of 22128723 is 32782122.

It is a happy number.

It is not a de Polignac number, because 22128723 - 2¹ = 22128721 is a prime.

It is a super-2 number, since 2×22128723² = 979360763221458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22128721) 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 5 ways as a sum of consecutive naturals, for example, 1229365 + ... + 1229382.

Almost surely, 2^22128723 is an apocalyptic number.

22128723 is a deficient number, since it is larger than the sum of its proper divisors (9835001).

22128723 is a wasteful number, since it uses less digits than its factorization.

22128723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458753 (or 2458750 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22128723 is about 4704.1176643447. The cubic root of 22128723 is about 280.7493659767.

The spelling of 22128723 in words is "twenty-two million, one hundred twenty-eight thousand, seven hundred twenty-three".