287987 has 4 divisors (see below), whose sum is σ = 329136. Its totient is φ = 246840.

The previous prime is 287977. The next prime is 288007. The reversal of 287987 is 789782.

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 287987 - 2⁸ = 287731 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287987.

It is not an unprimeable number, because it can be changed into a prime (287977) 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, 20564 + ... + 20577.

It is an arithmetic number, because the mean of its divisors is an integer number (82284).

2²⁸⁷⁹⁸⁷ is an apocalyptic number.

287987 is a deficient number, since it is larger than the sum of its proper divisors (41149).

287987 is an equidigital number, since it uses as much as digits as its factorization.

287987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41148.

The product of its digits is 56448, while the sum is 41.

The square root of 287987 is about 536.6442024284. The cubic root of 287987 is about 66.0375513274.

The spelling of 287987 in words is "two hundred eighty-seven thousand, nine hundred eighty-seven".