287660 has 24 divisors (see below), whose sum is σ = 636720. Its totient is φ = 108864.

The previous prime is 287629. The next prime is 287669. The reversal of 287660 is 66782.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287660.

It is not an unprimeable number, because it can be changed into a prime (287669) 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, 2 + ... + 758.

It is an arithmetic number, because the mean of its divisors is an integer number (26530).

2²⁸⁷⁶⁶⁰ is an apocalyptic number.

287660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 287660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318360).

287660 is an abundant number, since it is smaller than the sum of its proper divisors (349060).

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

287660 is a wasteful number, since it uses less digits than its factorization.

287660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 287660 is about 536.3394447549. The cubic root of 287660 is about 66.0125473543.

It can be divided in two parts, 287 and 660, that multiplied together give a triangular number (189420 = T₆₁₅).

The spelling of 287660 in words is "two hundred eighty-seven thousand, six hundred sixty".