287965 has 4 divisors (see below), whose sum is σ = 345564. Its totient is φ = 230368.

The previous prime is 287939. The next prime is 287977. The reversal of 287965 is 569782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 210681 = 278^2 + 459^2 .

It is a cyclic number.

It is not a de Polignac number, because 287965 - 2⁵ = 287933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28792 + ... + 28801.

It is an arithmetic number, because the mean of its divisors is an integer number (86391).

2²⁸⁷⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

287965 is a deficient number, since it is larger than the sum of its proper divisors (57599).

287965 is an equidigital number, since it uses as much as digits as its factorization.

287965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57598.

The product of its digits is 30240, while the sum is 37.

The square root of 287965 is about 536.6237042845. The cubic root of 287965 is about 66.0358696970.

The spelling of 287965 in words is "two hundred eighty-seven thousand, nine hundred sixty-five".