665320 has 16 divisors (see below), whose sum is σ = 1497060. Its totient is φ = 266112.

The previous prime is 665311. The next prime is 665351. The reversal of 665320 is 23566.

It can be written as a sum of positive squares in 2 ways, for example, as 617796 + 47524 = 786^2 + 218^2 .

It is a plaindrome in base 14.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665291 and 665300.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8277 + ... + 8356.

2⁶⁶⁵³²⁰ is an apocalyptic number.

It is an amenable number.

665320 is an abundant number, since it is smaller than the sum of its proper divisors (831740).

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

665320 is a wasteful number, since it uses less digits than its factorization.

665320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16644 (or 16640 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 665320 is about 815.6715025058. The cubic root of 665320 is about 87.2991857383.

Adding to 665320 its reverse (23566), we get a palindrome (688886).

The spelling of 665320 in words is "six hundred sixty-five thousand, three hundred twenty".