666288 has 60 divisors (see below), whose sum is σ = 2134288. Its totient is φ = 190080.

The previous prime is 666277. The next prime is 666301. The reversal of 666288 is 882666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678 + ... + 1338.

2⁶⁶⁶²⁸⁸ 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 666288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067144).

666288 is an abundant number, since it is smaller than the sum of its proper divisors (1468000).

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

666288 is a wasteful number, since it uses less digits than its factorization.

666288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 673 counting only the distinct ones).

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

The square root of 666288 is about 816.2646629617. The cubic root of 666288 is about 87.3415035510.

The spelling of 666288 in words is "six hundred sixty-six thousand, two hundred eighty-eight".