288666 has 48 divisors (see below), whose sum is σ = 748800. Its totient is φ = 78624.

The previous prime is 288661. The next prime is 288679. The reversal of 288666 is 666882.

288666 is a modest number, since divided by 666 gives 288 as remainder.

It is a Curzon number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 288666.

It is not an unprimeable number, because it can be changed into a prime (288661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3615 + ... + 3693.

It is an arithmetic number, because the mean of its divisors is an integer number (15600).

2²⁸⁸⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 288666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374400).

288666 is an abundant number, since it is smaller than the sum of its proper divisors (460134).

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

288666 is a wasteful number, since it uses less digits than its factorization.

288666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 120 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 288666 is about 537.2764651462. The cubic root of 288666 is about 66.0894105009.

The spelling of 288666 in words is "two hundred eighty-eight thousand, six hundred sixty-six".