287643 has 4 divisors (see below), whose sum is σ = 383528. Its totient is φ = 191760.

The previous prime is 287629. The next prime is 287669. The reversal of 287643 is 346782.

287643 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 287643 - 2⁵ = 287611 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

287643 is strictly pandigital in base 7.

287643 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 287643.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287643.

It is not an unprimeable number, because it can be changed into a prime (285643) 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, 47938 + ... + 47943.

It is an arithmetic number, because the mean of its divisors is an integer number (95882).

2²⁸⁷⁶⁴³ is an apocalyptic number.

287643 is a deficient number, since it is larger than the sum of its proper divisors (95885).

287643 is an equidigital number, since it uses as much as digits as its factorization.

287643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95884.

The product of its digits is 8064, while the sum is 30.

The square root of 287643 is about 536.3235963483. The cubic root of 287643 is about 66.0112469355.

The spelling of 287643 in words is "two hundred eighty-seven thousand, six hundred forty-three".