664297 has 4 divisors (see below), whose sum is σ = 699280. Its totient is φ = 629316.

The previous prime is 664289. The next prime is 664319. The reversal of 664297 is 792466.

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 664297 - 2³ = 664289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664597) 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, 17463 + ... + 17500.

It is an arithmetic number, because the mean of its divisors is an integer number (174820).

2⁶⁶⁴²⁹⁷ is an apocalyptic number.

It is an amenable number.

664297 is a deficient number, since it is larger than the sum of its proper divisors (34983).

664297 is a wasteful number, since it uses less digits than its factorization.

664297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34982.

The product of its digits is 18144, while the sum is 34.

The square root of 664297 is about 815.0441705822. The cubic root of 664297 is about 87.2544188696.

It can be divided in two parts, 664 and 297, that added together give a square (961 = 31²).

The spelling of 664297 in words is "six hundred sixty-four thousand, two hundred ninety-seven".