664512 has 28 divisors (see below), whose sum is σ = 1758696. Its totient is φ = 221440.

The previous prime is 664511. The next prime is 664529. The reversal of 664512 is 215466.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 664512.

It is not an unprimeable number, because it can be changed into a prime (664511) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1539 + ... + 1922.

2⁶⁶⁴⁵¹² is an apocalyptic number.

It is an amenable number.

664512 is an abundant number, since it is smaller than the sum of its proper divisors (1094184).

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

664512 is a wasteful number, since it uses less digits than its factorization.

664512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476 (or 3466 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 664512 is about 815.1760546042. The cubic root of 664512 is about 87.2638311639.

Adding to 664512 its reverse (215466), we get a palindrome (879978).

It can be divided in two parts, 664 and 512, that added together give a triangular number (1176 = T₄₈).

The spelling of 664512 in words is "six hundred sixty-four thousand, five hundred twelve".