6663320 has 64 divisors (see below), whose sum is σ = 16329600. Its totient is φ = 2437120.

The previous prime is 6663317. The next prime is 6663329. The reversal of 6663320 is 233666.

It is a happy number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6663320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27761 + ... + 27999.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

Almost surely, 2^6663320 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 6663320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8164800).

6663320 is an abundant number, since it is smaller than the sum of its proper divisors (9666280).

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

6663320 is a wasteful number, since it uses less digits than its factorization.

6663320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 6663320 is about 2581.3407369040. The cubic root of 6663320 is about 188.1757071658.

Adding to 6663320 its reverse (233666), we get a palindrome (6896986).

The spelling of 6663320 in words is "six million, six hundred sixty-three thousand, three hundred twenty".