28097287 has 2 divisors, whose sum is σ = 28097288. Its totient is φ = 28097286.

The previous prime is 28097233. The next prime is 28097323. The reversal of 28097287 is 78279082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28097287 - 2⁷ = 28097159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28097207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14048643 + 14048644.

It is an arithmetic number, because the mean of its divisors is an integer number (14048644).

Almost surely, 2^28097287 is an apocalyptic number.

28097287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28097287 is an equidigital number, since it uses as much as digits as its factorization.

28097287 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 28097287 is about 5300.6874082519. The cubic root of 28097287 is about 304.0101818785.

The spelling of 28097287 in words is "twenty-eight million, ninety-seven thousand, two hundred eighty-seven".