287687 has 4 divisors (see below), whose sum is σ = 293856. Its totient is φ = 281520.

The previous prime is 287681. The next prime is 287689. The reversal of 287687 is 786782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 287687 - 2⁴ = 287671 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 287687.

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 287687.

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 3 ways as a sum of consecutive naturals, for example, 3014 + ... + 3107.

It is an arithmetic number, because the mean of its divisors is an integer number (73464).

287687 is a Friedman number, since it can be written as 88^2+7+6^7, using all its digits and the basic arithmetic operations.

2²⁸⁷⁶⁸⁷ is an apocalyptic number.

287687 is a deficient number, since it is larger than the sum of its proper divisors (6169).

287687 is an equidigital number, since it uses as much as digits as its factorization.

287687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6168.

The product of its digits is 37632, while the sum is 38.

The square root of 287687 is about 536.3646147911. The cubic root of 287687 is about 66.0146126200.

The spelling of 287687 in words is "two hundred eighty-seven thousand, six hundred eighty-seven".