28870297 has 2 divisors, whose sum is σ = 28870298. Its totient is φ = 28870296.

The previous prime is 28870279. The next prime is 28870307. The reversal of 28870297 is 79207882.

Together with previous prime (28870279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 737881 = 5304^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 28870297 - 2¹¹ = 28868249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28870217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14435148 + 14435149.

It is an arithmetic number, because the mean of its divisors is an integer number (14435149).

Almost surely, 2^28870297 is an apocalyptic number.

It is an amenable number.

28870297 is a deficient number, since it is larger than the sum of its proper divisors (1).

28870297 is an equidigital number, since it uses as much as digits as its factorization.

28870297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 28870297 is about 5373.1086905068. The cubic root of 28870297 is about 306.7729650142.

The spelling of 28870297 in words is "twenty-eight million, eight hundred seventy thousand, two hundred ninety-seven".