287807 has 8 divisors (see below), whose sum is σ = 314160. Its totient is φ = 263640.

The previous prime is 287801. The next prime is 287813. The reversal of 287807 is 708782.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (287801) and next prime (287813).

It is a de Polignac number, because none of the positive numbers 2^k-287807 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

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 287807.

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, 2132 + ... + 2262.

It is an arithmetic number, because the mean of its divisors is an integer number (39270).

2²⁸⁷⁸⁰⁷ is an apocalyptic number.

287807 is a deficient number, since it is larger than the sum of its proper divisors (26353).

287807 is an equidigital number, since it uses as much as digits as its factorization.

287807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 287807 is about 536.4764673310. The cubic root of 287807 is about 66.0237900157.

The spelling of 287807 in words is "two hundred eighty-seven thousand, eight hundred seven".