28280297 has 2 divisors, whose sum is σ = 28280298. Its totient is φ = 28280296.

The previous prime is 28280269. The next prime is 28280311. The reversal of 28280297 is 79208282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27678121 + 602176 = 5261^2 + 776^2 .

It is a cyclic number.

It is not a de Polignac number, because 28280297 - 2¹² = 28276201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28280297.

It is not a weakly prime, because it can be changed into another prime (28280237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140148 + 14140149.

It is an arithmetic number, because the mean of its divisors is an integer number (14140149).

Almost surely, 2^28280297 is an apocalyptic number.

It is an amenable number.

28280297 is a deficient number, since it is larger than the sum of its proper divisors (1).

28280297 is an equidigital number, since it uses as much as digits as its factorization.

28280297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28280297 is about 5317.9222446365. The cubic root of 28280297 is about 304.6688046929.

The spelling of 28280297 in words is "twenty-eight million, two hundred eighty thousand, two hundred ninety-seven".