663617440 has 192 divisors, whose sum is σ = 1763596800. Its totient is φ = 234766336.

The previous prime is 663617417. The next prime is 663617477. The reversal of 663617440 is 44716366.

It is a self number, because there is not a number n which added to its sum of digits gives 663617440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3707271 + ... + 3707449.

It is an arithmetic number, because the mean of its divisors is an integer number (9185400).

Almost surely, 2^663617440 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 663617440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881798400).

663617440 is an abundant number, since it is smaller than the sum of its proper divisors (1099979360).

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

663617440 is a wasteful number, since it uses less digits than its factorization.

663617440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 663617440 is about 25760.7732803191. The cubic root of 663617440 is about 872.2465565460.

The spelling of 663617440 in words is "six hundred sixty-three million, six hundred seventeen thousand, four hundred forty".