666760 has 32 divisors (see below), whose sum is σ = 1526400. Its totient is φ = 262080.

The previous prime is 666751. The next prime is 666769. The reversal of 666760 is 67666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666751) and next prime (666769).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (666769) by changing a digit.

666760 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3055 + ... + 3265.

It is an arithmetic number, because the mean of its divisors is an integer number (47700).

2⁶⁶⁶⁷⁶⁰ 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 666760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763200).

666760 is an abundant number, since it is smaller than the sum of its proper divisors (859640).

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

666760 is a wasteful number, since it uses less digits than its factorization.

666760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 666760 is about 816.5537336881. The cubic root of 666760 is about 87.3621229922.

It can be divided in two parts, 6 and 66760, that added together give a palindrome (66766).

The spelling of 666760 in words is "six hundred sixty-six thousand, seven hundred sixty".