664832 has 54 divisors (see below), whose sum is σ = 1572858. Its totient is φ = 279552.

The previous prime is 664799. The next prime is 664843. The reversal of 664832 is 238466.

It can be written as a sum of positive squares in only one way, i.e., 614656 + 50176 = 784^2 + 224^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664795 and 664804.

It is a congruent number.

It is an unprimeable number.

664832 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 12518 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (29127).

2⁶⁶⁴⁸³² 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 664832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (786429).

664832 is an abundant number, since it is smaller than the sum of its proper divisors (908026).

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

664832 is an equidigital number, since it uses as much as digits as its factorization.

664832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 62 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 664832 is about 815.3723075994. The cubic root of 664832 is about 87.2778364012.

The spelling of 664832 in words is "six hundred sixty-four thousand, eight hundred thirty-two".