28017287 has 2 divisors, whose sum is σ = 28017288. Its totient is φ = 28017286.

The previous prime is 28017263. The next prime is 28017293. The reversal of 28017287 is 78271082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28017287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28010287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14008643 + 14008644.

It is an arithmetic number, because the mean of its divisors is an integer number (14008644).

Almost surely, 2^28017287 is an apocalyptic number.

28017287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28017287 is an equidigital number, since it uses as much as digits as its factorization.

28017287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28017287 is about 5293.1358380453. The cubic root of 28017287 is about 303.7213766093.

The spelling of 28017287 in words is "twenty-eight million, seventeen thousand, two hundred eighty-seven".