28823257 has 2 divisors, whose sum is σ = 28823258. Its totient is φ = 28823256.

The previous prime is 28823251. The next prime is 28823261. The reversal of 28823257 is 75232882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19219456 + 9603801 = 4384^2 + 3099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28823257 is a prime.

It is not a weakly prime, because it can be changed into another prime (28823251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14411628 + 14411629.

It is an arithmetic number, because the mean of its divisors is an integer number (14411629).

Almost surely, 2^28823257 is an apocalyptic number.

It is an amenable number.

28823257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28823257 is an equidigital number, since it uses as much as digits as its factorization.

28823257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 37.

The square root of 28823257 is about 5368.7295517655. The cubic root of 28823257 is about 306.6062602876.

The spelling of 28823257 in words is "twenty-eight million, eight hundred twenty-three thousand, two hundred fifty-seven".