664913 has 4 divisors (see below), whose sum is σ = 673008. Its totient is φ = 656820.

The previous prime is 664891. The next prime is 664933. The reversal of 664913 is 319466.

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 664913 - 2⁶ = 664849 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664913.

It is not an unprimeable number, because it can be changed into a prime (664933) 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, 3923 + ... + 4088.

It is an arithmetic number, because the mean of its divisors is an integer number (168252).

2⁶⁶⁴⁹¹³ is an apocalyptic number.

It is an amenable number.

664913 is a deficient number, since it is larger than the sum of its proper divisors (8095).

664913 is an equidigital number, since it uses as much as digits as its factorization.

664913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8094.

The product of its digits is 3888, while the sum is 29.

The square root of 664913 is about 815.4219766477. The cubic root of 664913 is about 87.2813807641.

The spelling of 664913 in words is "six hundred sixty-four thousand, nine hundred thirteen".