660568 has 8 divisors (see below), whose sum is σ = 1238580. Its totient is φ = 330280.

The previous prime is 660563. The next prime is 660589. The reversal of 660568 is 865066.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660563) by changing a digit.

660568 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 as a sum of consecutive naturals, namely, 41278 + ... + 41293.

2⁶⁶⁰⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

660568 is a deficient number, since it is larger than the sum of its proper divisors (578012).

660568 is a wasteful number, since it uses less digits than its factorization.

660568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82577 (or 82573 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 660568 is about 812.7533451177. The cubic root of 660568 is about 87.0908462240.

The spelling of 660568 in words is "six hundred sixty thousand, five hundred sixty-eight".