665360 has 20 divisors (see below), whose sum is σ = 1547148. Its totient is φ = 266112.

The previous prime is 665359. The next prime is 665369. The reversal of 665360 is 63566.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 169744 = 704^2 + 412^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (665369) 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 3 ways as a sum of consecutive naturals, for example, 4079 + ... + 4238.

2⁶⁶⁵³⁶⁰ is an apocalyptic number.

It is an amenable number.

665360 is an abundant number, since it is smaller than the sum of its proper divisors (881788).

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

665360 is a wasteful number, since it uses less digits than its factorization.

665360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330 (or 8324 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 665360 is about 815.6960218120. The cubic root of 665360 is about 87.3009352210.

The spelling of 665360 in words is "six hundred sixty-five thousand, three hundred sixty".