665632 has 48 divisors (see below), whose sum is σ = 1499904. Its totient is φ = 288000.

The previous prime is 665629. The next prime is 665633. The reversal of 665632 is 236566.

It is a self number, because there is not a number n which added to its sum of digits gives 665632.

It is not an unprimeable number, because it can be changed into a prime (665633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10882 + ... + 10942.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2⁶⁶⁵⁶³² is an apocalyptic number.

665632 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749952).

665632 is an abundant number, since it is smaller than the sum of its proper divisors (834272).

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

665632 is a wasteful number, since it uses less digits than its factorization.

665632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 105 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

The square root of 665632 is about 815.8627335526. The cubic root of 665632 is about 87.3128298441.

The spelling of 665632 in words is "six hundred sixty-five thousand, six hundred thirty-two".