660320 has 24 divisors (see below), whose sum is σ = 1560384. Its totient is φ = 264064.

The previous prime is 660299. The next prime is 660329. The reversal of 660320 is 23066.

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 660320.

It is not an unprimeable number, because it can be changed into a prime (660329) by changing a digit.

660320 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 3 ways as a sum of consecutive naturals, for example, 1904 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (65016).

2⁶⁶⁰³²⁰ is an apocalyptic number.

It is an amenable number.

660320 is an abundant number, since it is smaller than the sum of its proper divisors (900064).

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

660320 is a wasteful number, since it uses less digits than its factorization.

660320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4142 (or 4134 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 660320 is about 812.6007629827. The cubic root of 660320 is about 87.0799458910.

Adding to 660320 its reverse (23066), we get a palindrome (683386).

The spelling of 660320 in words is "six hundred sixty thousand, three hundred twenty".