28287 has 12 divisors (see below), whose sum is σ = 46800. Its totient is φ = 16128.

The previous prime is 28283. The next prime is 28289. The reversal of 28287 is 78282.

It is not a de Polignac number, because 28287 - 2² = 28283 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28287.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28287.

It is not an unprimeable number, because it can be changed into a prime (28283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162 + ... + 287.

It is an arithmetic number, because the mean of its divisors is an integer number (3900).

2²⁸²⁸⁷ is an apocalyptic number.

28287 is a deficient number, since it is larger than the sum of its proper divisors (18513).

28287 is a wasteful number, since it uses less digits than its factorization.

28287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 459 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 28287 is about 168.1873954849. The cubic root of 28287 is about 30.4692873672.

The spelling of 28287 in words is "twenty-eight thousand, two hundred eighty-seven".