22428257 has 2 divisors, whose sum is σ = 22428258. Its totient is φ = 22428256.

The previous prime is 22428233. The next prime is 22428269. The reversal of 22428257 is 75282422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 10601536 = 3439^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 22428257 - 2⁸ = 22428001 is a prime.

It is not a weakly prime, because it can be changed into another prime (22428277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11214128 + 11214129.

It is an arithmetic number, because the mean of its divisors is an integer number (11214129).

Almost surely, 2^22428257 is an apocalyptic number.

It is an amenable number.

22428257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22428257 is an equidigital number, since it uses as much as digits as its factorization.

22428257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17920, while the sum is 32.

The square root of 22428257 is about 4735.8480761106. The cubic root of 22428257 is about 282.0104325232.

The spelling of 22428257 in words is "twenty-two million, four hundred twenty-eight thousand, two hundred fifty-seven".