28297 has 2 divisors, whose sum is σ = 28298. Its totient is φ = 28296.

The previous prime is 28289. The next prime is 28307. The reversal of 28297 is 79282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18496 + 9801 = 136^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 28297 - 2³ = 28289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14148 + 14149.

It is an arithmetic number, because the mean of its divisors is an integer number (14149).

2²⁸²⁹⁷ is an apocalyptic number.

It is an amenable number.

28297 is a deficient number, since it is larger than the sum of its proper divisors (1).

28297 is an equidigital number, since it uses as much as digits as its factorization.

28297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 28297 is about 168.2171216018. The cubic root of 28297 is about 30.4728774378.

It can be divided in two parts, 28 and 297, that added together give a triangular number (325 = T₂₅).

The spelling of 28297 in words is "twenty-eight thousand, two hundred ninety-seven".