664593 has 8 divisors (see below), whose sum is σ = 916800. Its totient is φ = 427728.

The previous prime is 664589. The next prime is 664597. The reversal of 664593 is 395466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664589) and next prime (664597).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664593 - 2² = 664589 is a prime.

It is an Ulam 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 7 ways as a sum of consecutive naturals, for example, 3733 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (114600).

2⁶⁶⁴⁵⁹³ is an apocalyptic number.

It is an amenable number.

664593 is a deficient number, since it is larger than the sum of its proper divisors (252207).

664593 is a wasteful number, since it uses less digits than its factorization.

664593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7671.

The product of its digits is 19440, while the sum is 33.

The square root of 664593 is about 815.2257356095. The cubic root of 664593 is about 87.2673766645.

The spelling of 664593 in words is "six hundred sixty-four thousand, five hundred ninety-three".