287684 has 24 divisors (see below), whose sum is σ = 544320. Its totient is φ = 132704.

The previous prime is 287681. The next prime is 287689. The reversal of 287684 is 486782.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287684.

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 7 ways as a sum of consecutive naturals, for example, 4847 + ... + 4905.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

287684 is a Friedman number, since it can be written as 88^2+6^7+4, using all its digits and the basic arithmetic operations.

2²⁸⁷⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

287684 is a deficient number, since it is larger than the sum of its proper divisors (256636).

287684 is a wasteful number, since it uses less digits than its factorization.

287684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 137 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 287684 is about 536.3618181787. The cubic root of 287684 is about 66.0143831524.

The spelling of 287684 in words is "two hundred eighty-seven thousand, six hundred eighty-four".