664375608 has 256 divisors, whose sum is σ = 2115993600. Its totient is φ = 193995648.

The previous prime is 664375567. The next prime is 664375619. The reversal of 664375608 is 806573466.

664375608 is a `hidden beast` number, since 6 + 6 + 4 + 37 + 5 + 608 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5231241 + ... + 5231367.

It is an arithmetic number, because the mean of its divisors is an integer number (8265600).

Almost surely, 2^664375608 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 664375608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057996800).

664375608 is an abundant number, since it is smaller than the sum of its proper divisors (1451617992).

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

664375608 is a wasteful number, since it uses less digits than its factorization.

664375608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 664375608 is about 25775.4846317193. The cubic root of 664375608 is about 872.5786041503.

The spelling of 664375608 in words is "six hundred sixty-four million, three hundred seventy-five thousand, six hundred eight".