287220 has 24 divisors (see below), whose sum is σ = 804384. Its totient is φ = 76576.

The previous prime is 287219. The next prime is 287233. The reversal of 287220 is 22782.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2334 + ... + 2453.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2²⁸⁷²²⁰ is an apocalyptic number.

287220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

287220 is an abundant number, since it is smaller than the sum of its proper divisors (517164).

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

287220 is a wasteful number, since it uses less digits than its factorization.

287220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799 (or 4797 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 287220 is about 535.9290997884. The cubic root of 287220 is about 65.9788729440.

The spelling of 287220 in words is "two hundred eighty-seven thousand, two hundred twenty".