22784257 has 2 divisors, whose sum is σ = 22784258. Its totient is φ = 22784256.

The previous prime is 22784243. The next prime is 22784261. The reversal of 22784257 is 75248722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 9759376 = 3609^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 22784257 - 2²³ = 14395649 is a prime.

It is not a weakly prime, because it can be changed into another prime (22784057) 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 as a sum of consecutive naturals, namely, 11392128 + 11392129.

It is an arithmetic number, because the mean of its divisors is an integer number (11392129).

Almost surely, 2^22784257 is an apocalyptic number.

It is an amenable number.

22784257 is a deficient number, since it is larger than the sum of its proper divisors (1).

22784257 is an equidigital number, since it uses as much as digits as its factorization.

22784257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 37.

The square root of 22784257 is about 4773.2857655917. The cubic root of 22784257 is about 283.4947083775.

The spelling of 22784257 in words is "twenty-two million, seven hundred eighty-four thousand, two hundred fifty-seven".