664536 has 16 divisors (see below), whose sum is σ = 1661400. Its totient is φ = 221504.

The previous prime is 664529. The next prime is 664537. The reversal of 664536 is 635466.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 13821 + ... + 13868.

2⁶⁶⁴⁵³⁶ is an apocalyptic number.

It is an amenable number.

664536 is an abundant number, since it is smaller than the sum of its proper divisors (996864).

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

664536 is a wasteful number, since it uses less digits than its factorization.

664536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27698 (or 27694 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 664536 is about 815.1907752177. The cubic root of 664536 is about 87.2648817127.

The spelling of 664536 in words is "six hundred sixty-four thousand, five hundred thirty-six".