664608 has 96 divisors (see below), whose sum is σ = 2128896. Its totient is φ = 177408.

The previous prime is 664603. The next prime is 664613. The reversal of 664608 is 806466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664603) and next prime (664613).

It is a tau number, because it is divible by the number of its divisors (96).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664608.

It is not an unprimeable number, because it can be changed into a prime (664603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15435 + ... + 15477.

It is an arithmetic number, because the mean of its divisors is an integer number (22176).

2⁶⁶⁴⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064448).

664608 is an abundant number, since it is smaller than the sum of its proper divisors (1464288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664608 is a wasteful number, since it uses less digits than its factorization.

664608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 664608 is about 815.2349354634. The cubic root of 664608 is about 87.2680332071.

The spelling of 664608 in words is "six hundred sixty-four thousand, six hundred eight".