664452 has 18 divisors (see below), whose sum is σ = 1679678. Its totient is φ = 221472.

The previous prime is 664441. The next prime is 664459. The reversal of 664452 is 254466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 46656 = 786^2 + 216^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (664459) by changing a digit.

664452 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 (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9193 + ... + 9264.

2⁶⁶⁴⁴⁵² is an apocalyptic number.

It is an amenable number.

664452 is an abundant number, since it is smaller than the sum of its proper divisors (1015226).

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

664452 is a wasteful number, since it uses less digits than its factorization.

664452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18467 (or 18462 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 664452 is about 815.1392519073. The cubic root of 664452 is about 87.2612046814.

The spelling of 664452 in words is "six hundred sixty-four thousand, four hundred fifty-two".