28497257 has 2 divisors, whose sum is σ = 28497258. Its totient is φ = 28497256.

The previous prime is 28497247. The next prime is 28497263. The reversal of 28497257 is 75279482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24019801 + 4477456 = 4901^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 28497257 - 2⁶ = 28497193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28497247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14248628 + 14248629.

It is an arithmetic number, because the mean of its divisors is an integer number (14248629).

Almost surely, 2^28497257 is an apocalyptic number.

It is an amenable number.

28497257 is a deficient number, since it is larger than the sum of its proper divisors (1).

28497257 is an equidigital number, since it uses as much as digits as its factorization.

28497257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 44.

The square root of 28497257 is about 5338.2822143457. The cubic root of 28497257 is about 305.4459373084.

The spelling of 28497257 in words is "twenty-eight million, four hundred ninety-seven thousand, two hundred fifty-seven".