287685 has 16 divisors (see below), whose sum is σ = 511680. Its totient is φ = 153360.

The previous prime is 287681. The next prime is 287689. The reversal of 287685 is 586782.

It is an interprime number because it is at equal distance from previous prime (287681) and next prime (287689).

It is not a de Polignac number, because 287685 - 2² = 287681 is a prime.

It is a Curzon number.

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 287685.

It is not an unprimeable number, because it can be changed into a prime (287681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 931 + ... + 1200.

It is an arithmetic number, because the mean of its divisors is an integer number (31980).

287685 is a Friedman number, since it can be written as 88^2+6^7+5, using all its digits and the basic arithmetic operations.

2²⁸⁷⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

287685 is a deficient number, since it is larger than the sum of its proper divisors (223995).

287685 is a wasteful number, since it uses less digits than its factorization.

287685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145 (or 2139 counting only the distinct ones).

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

The square root of 287685 is about 536.3627503845. The cubic root of 287685 is about 66.0144596418.

The spelling of 287685 in words is "two hundred eighty-seven thousand, six hundred eighty-five".