28517287 has 2 divisors, whose sum is σ = 28517288. Its totient is φ = 28517286.

The previous prime is 28517273. The next prime is 28517311. The reversal of 28517287 is 78271582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28517287 - 2²³ = 20128679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28517207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14258643 + 14258644.

It is an arithmetic number, because the mean of its divisors is an integer number (14258644).

Almost surely, 2^28517287 is an apocalyptic number.

28517287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28517287 is an equidigital number, since it uses as much as digits as its factorization.

28517287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 40.

The square root of 28517287 is about 5340.1579564653. The cubic root of 28517287 is about 305.5174839520.

The spelling of 28517287 in words is "twenty-eight million, five hundred seventeen thousand, two hundred eighty-seven".