Adding to 664430 its reverse (34466), we get a palindrome (698896).
664430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a Curzon number.
It is a nialpdrome in base 10.
It is a congruent number.
It is an unprimeable number.
2664430 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
664430 is a wasteful number, since it uses less digits than its factorization.
664430 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 308.
The square root of 664430 is about 815.1257571688. The cubic root of 664430 is about 87.2602415982.
The spelling of 664430 in words is "six hundred sixty-four thousand, four hundred thirty".