660564 has 36 divisors (see below), whose sum is σ = 1703520. Its totient is φ = 215760.

The previous prime is 660563. The next prime is 660589. The reversal of 660564 is 465066.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660564.

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

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 11 ways as a sum of consecutive naturals, for example, 1969 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (47320).

2⁶⁶⁰⁵⁶⁴ 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 660564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851760).

660564 is an abundant number, since it is smaller than the sum of its proper divisors (1042956).

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

660564 is a wasteful number, since it uses less digits than its factorization.

660564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 660564 is about 812.7508843428. The cubic root of 660564 is about 87.0906704338.

The spelling of 660564 in words is "six hundred sixty thousand, five hundred sixty-four".