664908 has 24 divisors (see below), whose sum is σ = 1576512. Its totient is φ = 218064.

The previous prime is 664891. The next prime is 664933. The reversal of 664908 is 809466.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664908.

It is an unprimeable number.

664908 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 in 7 ways as a sum of consecutive naturals, for example, 391 + ... + 1217.

It is an arithmetic number, because the mean of its divisors is an integer number (65688).

2⁶⁶⁴⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

664908 is an abundant number, since it is smaller than the sum of its proper divisors (911604).

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

664908 is a wasteful number, since it uses less digits than its factorization.

664908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 664908 is about 815.4189107447. The cubic root of 664908 is about 87.2811619847.

The spelling of 664908 in words is "six hundred sixty-four thousand, nine hundred eight".