287812 has 24 divisors (see below), whose sum is σ = 607040. Its totient is φ = 116640.

The previous prime is 287801. The next prime is 287813. The reversal of 287812 is 218782.

287812 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262 + ... + 802.

2²⁸⁷⁸¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303520).

287812 is an abundant number, since it is smaller than the sum of its proper divisors (319228).

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

287812 is a wasteful number, since it uses less digits than its factorization.

287812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 569 counting only the distinct ones).

The product of its digits is 1792, while the sum is 28.

The square root of 287812 is about 536.4811273475. The cubic root of 287812 is about 66.0241723518.

The spelling of 287812 in words is "two hundred eighty-seven thousand, eight hundred twelve".