287998 has 4 divisors (see below), whose sum is σ = 432000. Its totient is φ = 143998.

The previous prime is 287977. The next prime is 288007. The reversal of 287998 is 899782.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 71998 + ... + 72001.

It is an arithmetic number, because the mean of its divisors is an integer number (108000).

2²⁸⁷⁹⁹⁸ is an apocalyptic number.

287998 is a deficient number, since it is larger than the sum of its proper divisors (144002).

287998 is a wasteful number, since it uses less digits than its factorization.

287998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144001.

The product of its digits is 72576, while the sum is 43.

The square root of 287998 is about 536.6544512067. The cubic root of 287998 is about 66.0383921105.

The spelling of 287998 in words is "two hundred eighty-seven thousand, nine hundred ninety-eight".