663908 has 24 divisors (see below), whose sum is σ = 1345344. Its totient is φ = 280800.

The previous prime is 663907. The next prime is 663937. The reversal of 663908 is 809366.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (663907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3578 + ... + 3758.

It is an arithmetic number, because the mean of its divisors is an integer number (56056).

2⁶⁶³⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

663908 is an abundant number, since it is smaller than the sum of its proper divisors (681436).

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

663908 is a wasteful number, since it uses less digits than its factorization.

663908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 663908 is about 814.8054982632. The cubic root of 663908 is about 87.2373840211.

The spelling of 663908 in words is "six hundred sixty-three thousand, nine hundred eight".