664532 has 18 divisors (see below), whose sum is σ = 1279194. Its totient is φ = 301840.

The previous prime is 664529. The next prime is 664537. The reversal of 664532 is 235466.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 1936 = 814^2 + 44^2 .

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664532.

It is not an unprimeable number, because it can be changed into a prime (664537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203 + ... + 1170.

2⁶⁶⁴⁵³² is an apocalyptic number.

It is an amenable number.

664532 is a deficient number, since it is larger than the sum of its proper divisors (614662).

664532 is a wasteful number, since it uses less digits than its factorization.

664532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399 (or 1386 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 664532 is about 815.1883218006. The cubic root of 664532 is about 87.2647066230.

Adding to 664532 its reverse (235466), we get a palindrome (899998).

The spelling of 664532 in words is "six hundred sixty-four thousand, five hundred thirty-two".