663949608 has 96 divisors (see below), whose sum is σ = 1983189600. Its totient is φ = 184560768.

The previous prime is 663949591. The next prime is 663949621. The reversal of 663949608 is 806949366.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35883 + ... + 51141.

It is an arithmetic number, because the mean of its divisors is an integer number (20658225).

Almost surely, 2^663949608 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 663949608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991594800).

663949608 is an abundant number, since it is smaller than the sum of its proper divisors (1319239992).

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

663949608 is a wasteful number, since it uses less digits than its factorization.

663949608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15319 (or 15308 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 663949608 is about 25767.2196404657. The cubic root of 663949608 is about 872.3920641076.

The spelling of 663949608 in words is "six hundred sixty-three million, nine hundred forty-nine thousand, six hundred eight".