665268 has 12 divisors (see below), whose sum is σ = 1552320. Its totient is φ = 221752.

The previous prime is 665267. The next prime is 665279. The reversal of 665268 is 862566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

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 665268.

It is not an unprimeable number, because it can be changed into a prime (665267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27708 + ... + 27731.

It is an arithmetic number, because the mean of its divisors is an integer number (129360).

2⁶⁶⁵²⁶⁸ is an apocalyptic number.

It is an amenable number.

665268 is an abundant number, since it is smaller than the sum of its proper divisors (887052).

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

665268 is a wasteful number, since it uses less digits than its factorization.

665268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55446 (or 55444 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 665268 is about 815.6396263056. The cubic root of 665268 is about 87.2969113060.

The spelling of 665268 in words is "six hundred sixty-five thousand, two hundred sixty-eight".