663245440 has 128 divisors (see below), whose sum is σ = 1863025920. Its totient is φ = 222597120.

The previous prime is 663245431. The next prime is 663245467. The reversal of 663245440 is 44542366.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 663245396 and 663245405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87897 + ... + 95143.

It is an arithmetic number, because the mean of its divisors is an integer number (14554890).

Almost surely, 2^663245440 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 663245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931512960).

663245440 is an abundant number, since it is smaller than the sum of its proper divisors (1199780480).

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

663245440 is a wasteful number, since it uses less digits than its factorization.

663245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290 (or 7278 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 663245440 is about 25753.5519880268. The cubic root of 663245440 is about 872.0835427632.

The spelling of 663245440 in words is "six hundred sixty-three million, two hundred forty-five thousand, four hundred forty".