664573 has 16 divisors (see below), whose sum is σ = 837760. Its totient is φ = 513216.

The previous prime is 664571. The next prime is 664579. The reversal of 664573 is 375466.

It is a cyclic number.

It is not a de Polignac number, because 664573 - 2¹ = 664571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6043 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (52360).

2⁶⁶⁴⁵⁷³ is an apocalyptic number.

It is an amenable number.

664573 is a deficient number, since it is larger than the sum of its proper divisors (173187).

664573 is a wasteful number, since it uses less digits than its factorization.

664573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196.

The product of its digits is 15120, while the sum is 31.

The square root of 664573 is about 815.2134689761. The cubic root of 664573 is about 87.2665012591.

The spelling of 664573 in words is "six hundred sixty-four thousand, five hundred seventy-three".