287289 has 12 divisors (see below), whose sum is σ = 419796. Its totient is φ = 189312.

The previous prime is 287281. The next prime is 287291. The reversal of 287289 is 982782.

It can be written as a sum of positive squares in 2 ways, for example, as 110889 + 176400 = 333^2 + 420^2 .

It is not a de Polignac number, because 287289 - 2³ = 287281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (287281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (34983).

2²⁸⁷²⁸⁹ is an apocalyptic number.

It is an amenable number.

287289 is a deficient number, since it is larger than the sum of its proper divisors (132507).

287289 is a wasteful number, since it uses less digits than its factorization.

287289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 373 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 287289 is about 535.9934701095. The cubic root of 287289 is about 65.9841559764.

It can be divided in two parts, 287 and 289, that added together give a square (576 = 24²).

The spelling of 287289 in words is "two hundred eighty-seven thousand, two hundred eighty-nine".