664588 has 6 divisors (see below), whose sum is σ = 1163036. Its totient is φ = 332292.

The previous prime is 664583. The next prime is 664589. The reversal of 664588 is 885466.

It is not an unprimeable number, because it can be changed into a prime (664583) by changing a digit.

664588 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83070 + ... + 83077.

2⁶⁶⁴⁵⁸⁸ is an apocalyptic number.

It is an amenable number.

664588 is a deficient number, since it is larger than the sum of its proper divisors (498448).

664588 is a wasteful number, since it uses less digits than its factorization.

664588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166151 (or 166149 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 664588 is about 815.2226689684. Note that the first 3 decimals coincide. The cubic root of 664588 is about 87.2671578148.

It can be divided in two parts, 66458 and 8, that added together give a palindrome (66466).

The spelling of 664588 in words is "six hundred sixty-four thousand, five hundred eighty-eight".