285687 has 10 divisors (see below), whose sum is σ = 426888. Its totient is φ = 190404.

The previous prime is 285673. The next prime is 285697. The reversal of 285687 is 786582.

It is not a de Polignac number, because 285687 - 2⁷ = 285559 is a prime.

285687 is a lucky number.

It is a plaindrome in base 15.

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 285687.

It is not an unprimeable number, because it can be changed into a prime (285667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1683 + ... + 1844.

2²⁸⁵⁶⁸⁷ is an apocalyptic number.

285687 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

285687 is a deficient number, since it is larger than the sum of its proper divisors (141201).

285687 is an equidigital number, since it uses as much as digits as its factorization.

285687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539 (or 3530 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 285687 is about 534.4969597668. The cubic root of 285687 is about 65.8612788833.

The spelling of 285687 in words is "two hundred eighty-five thousand, six hundred eighty-seven".