287871 has 4 divisors (see below), whose sum is σ = 383832. Its totient is φ = 191912.

The previous prime is 287867. The next prime is 287873. The reversal of 287871 is 178782.

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 287871 - 2² = 287867 is a prime.

It is a D-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 287871.

It is not an unprimeable number, because it can be changed into a prime (287873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47976 + ... + 47981.

It is an arithmetic number, because the mean of its divisors is an integer number (95958).

2²⁸⁷⁸⁷¹ is an apocalyptic number.

287871 is a deficient number, since it is larger than the sum of its proper divisors (95961).

287871 is an equidigital number, since it uses as much as digits as its factorization.

287871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95960.

The product of its digits is 6272, while the sum is 33.

The square root of 287871 is about 536.5361124845. The cubic root of 287871 is about 66.0286835837.

The spelling of 287871 in words is "two hundred eighty-seven thousand, eight hundred seventy-one".