664575 has 12 divisors (see below), whose sum is σ = 1098888. Its totient is φ = 354400.

The previous prime is 664571. The next prime is 664579. The reversal of 664575 is 575466.

It is an interprime number because it is at equal distance from previous prime (664571) and next prime (664579).

It is not a de Polignac number, because 664575 - 2² = 664571 is a prime.

664575 is a lucky number.

It is a plaindrome in base 9.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4356 + ... + 4505.

It is an arithmetic number, because the mean of its divisors is an integer number (91574).

2⁶⁶⁴⁵⁷⁵ is an apocalyptic number.

664575 is a deficient number, since it is larger than the sum of its proper divisors (434313).

664575 is a wasteful number, since it uses less digits than its factorization.

664575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874 (or 8869 counting only the distinct ones).

The product of its digits is 25200, while the sum is 33.

The square root of 664575 is about 815.2146956477. The cubic root of 664575 is about 87.2665888004.

The spelling of 664575 in words is "six hundred sixty-four thousand, five hundred seventy-five".