663206320 has 80 divisors (see below), whose sum is σ = 1765601280. Its totient is φ = 226950912.

The previous prime is 663206317. The next prime is 663206333. The reversal of 663206320 is 23602366.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 460161 + ... + 461599.

It is an arithmetic number, because the mean of its divisors is an integer number (22070016).

Almost surely, 2^663206320 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 663206320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882800640).

663206320 is an abundant number, since it is smaller than the sum of its proper divisors (1102394960).

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

663206320 is a wasteful number, since it uses less digits than its factorization.

663206320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282 (or 2276 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 663206320 is about 25752.7924699439. The cubic root of 663206320 is about 872.0663964817.

Adding to 663206320 its reverse (23602366), we get a palindrome (686808686).

The spelling of 663206320 in words is "six hundred sixty-three million, two hundred six thousand, three hundred twenty".