665264 has 10 divisors (see below), whose sum is σ = 1288980. Its totient is φ = 332624.

The previous prime is 665251. The next prime is 665267. The reversal of 665264 is 462566.

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 as a sum of consecutive naturals, namely, 20774 + ... + 20805.

It is an arithmetic number, because the mean of its divisors is an integer number (128898).

2⁶⁶⁵²⁶⁴ is an apocalyptic number.

It is an amenable number.

665264 is a deficient number, since it is larger than the sum of its proper divisors (623716).

665264 is a wasteful number, since it uses less digits than its factorization.

665264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41587 (or 41581 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 665264 is about 815.6371742386. The cubic root of 665264 is about 87.2967363447.

It can be divided in two parts, 665 and 264, that added together give a palindrome (929).

The spelling of 665264 in words is "six hundred sixty-five thousand, two hundred sixty-four".