664413 has 4 divisors (see below), whose sum is σ = 885888. Its totient is φ = 442940.

The previous prime is 664403. The next prime is 664421. The reversal of 664413 is 314466.

664413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664413 - 2⁵ = 664381 is a prime.

It is a D-number.

It is a Curzon number.

It is a plaindrome in base 9.

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 664413.

It is not an unprimeable number, because it can be changed into a prime (664403) 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, 110733 + ... + 110738.

It is an arithmetic number, because the mean of its divisors is an integer number (221472).

2⁶⁶⁴⁴¹³ is an apocalyptic number.

It is an amenable number.

664413 is a deficient number, since it is larger than the sum of its proper divisors (221475).

664413 is a wasteful number, since it uses less digits than its factorization.

664413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221474.

The product of its digits is 1728, while the sum is 24.

The square root of 664413 is about 815.1153292633. The cubic root of 664413 is about 87.2594973830.

Adding to 664413 its reverse (314466), we get a palindrome (978879).

The spelling of 664413 in words is "six hundred sixty-four thousand, four hundred thirteen".