22628321 has 4 divisors (see below), whose sum is σ = 22938372. Its totient is φ = 22318272.

The previous prime is 22628317. The next prime is 22628327. The reversal of 22628321 is 12382622.

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 19018321 + 3610000 = 4361^2 + 1900^2 .

It is a cyclic number.

It is not a de Polignac number, because 22628321 - 2² = 22628317 is a prime.

It is a super-2 number, since 2×22628321² = 1024081822558082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22628327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154916 + ... + 155061.

It is an arithmetic number, because the mean of its divisors is an integer number (5734593).

Almost surely, 2^22628321 is an apocalyptic number.

It is an amenable number.

22628321 is a deficient number, since it is larger than the sum of its proper divisors (310051).

22628321 is an equidigital number, since it uses as much as digits as its factorization.

22628321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310050.

The product of its digits is 2304, while the sum is 26.

The square root of 22628321 is about 4756.9234805702. The cubic root of 22628321 is about 282.8464790996.

The spelling of 22628321 in words is "twenty-two million, six hundred twenty-eight thousand, three hundred twenty-one".