28687 has 2 divisors, whose sum is σ = 28688. Its totient is φ = 28686.

The previous prime is 28669. The next prime is 28697. The reversal of 28687 is 78682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28687 - 2⁷ = 28559 is a prime.

It is a nialpdrome in base 14 and base 15.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343 + 14344.

It is an arithmetic number, because the mean of its divisors is an integer number (14344).

2²⁸⁶⁸⁷ is an apocalyptic number.

28687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687 is an equidigital number, since it uses as much as digits as its factorization.

28687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 31.

The square root of 28687 is about 169.3723708283. The cubic root of 28687 is about 30.6122354135.

It can be divided in two parts, 286 and 87, that added together give a palindrome (373).

The spelling of 28687 in words is "twenty-eight thousand, six hundred eighty-seven".