287900 has 18 divisors (see below), whose sum is σ = 624960. Its totient is φ = 115120.

The previous prime is 287887. The next prime is 287921. The reversal of 287900 is 9782.

It is a self number, because there is not a number n which added to its sum of digits gives 287900.

It is a congruent number.

It is an unprimeable number.

287900 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1340 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (34720).

2²⁸⁷⁹⁰⁰ is an apocalyptic number.

287900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287900 is an abundant number, since it is smaller than the sum of its proper divisors (337060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

287900 is a wasteful number, since it uses less digits than its factorization.

287900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2893 (or 2886 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 287900 is about 536.5631370119. The cubic root of 287900 is about 66.0309007430.

The spelling of 287900 in words is "two hundred eighty-seven thousand, nine hundred".