287804 has 24 divisors (see below), whose sum is σ = 569856. Its totient is φ = 126000.

The previous prime is 287801. The next prime is 287813. The reversal of 287804 is 408782.

It is a super-2 number, since 2×287804² = 165662284832, which contains 22 as substring.

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 287804.

It is not an unprimeable number, because it can be changed into a prime (287801) 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, 1259 + ... + 1469.

It is an arithmetic number, because the mean of its divisors is an integer number (23744).

2²⁸⁷⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

287804 is a deficient number, since it is larger than the sum of its proper divisors (282052).

287804 is a wasteful number, since it uses less digits than its factorization.

287804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 287804 is about 536.4736713018. The cubic root of 287804 is about 66.0235606119.

The spelling of 287804 in words is "two hundred eighty-seven thousand, eight hundred four".