660756 has 48 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 199680.

The previous prime is 660733. The next prime is 660757. The reversal of 660756 is 657066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660757) by changing a digit.

660756 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 15 ways as a sum of consecutive naturals, for example, 8325 + ... + 8403.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁶⁶⁰⁷⁵⁶ 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 660756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846720).

660756 is an abundant number, since it is smaller than the sum of its proper divisors (1032684).

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

660756 is a wasteful number, since it uses less digits than its factorization.

660756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 660756 is about 812.8689931348. The cubic root of 660756 is about 87.0991075617.

The spelling of 660756 in words is "six hundred sixty thousand, seven hundred fifty-six".