665244 has 36 divisors (see below), whose sum is σ = 1782144. Its totient is φ = 208512.

The previous prime is 665239. The next prime is 665251. The reversal of 665244 is 442566.

It is a happy number.

665244 is a `hidden beast` number, since 6 + 652 + 4 + 4 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (49504).

2⁶⁶⁵²⁴⁴ 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 665244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891072).

665244 is an abundant number, since it is smaller than the sum of its proper divisors (1116900).

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

665244 is a wasteful number, since it uses less digits than its factorization.

665244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1109 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 665244 is about 815.6249137931. The cubic root of 665244 is about 87.2958615280.

It can be divided in two parts, 665 and 244, that added together give a palindrome (909).

The spelling of 665244 in words is "six hundred sixty-five thousand, two hundred forty-four".