6665728320 has 168 divisors, whose sum is σ = 23093659680. Its totient is φ = 1764633600.

The previous prime is 6665728313. The next prime is 6665728343. The reversal of 6665728320 is 238275666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 391995 + ... + 408645.

It is an arithmetic number, because the mean of its divisors is an integer number (137462260).

Almost surely, 2^6665728320 is an apocalyptic number.

6665728320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665728320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11546829840).

6665728320 is an abundant number, since it is smaller than the sum of its proper divisors (16427931360).

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

6665728320 is a wasteful number, since it uses less digits than its factorization.

6665728320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16813 (or 16800 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 6665728320 is about 81643.9117142240. The cubic root of 6665728320 is about 1881.9837518168.

The spelling of 6665728320 in words is "six billion, six hundred sixty-five million, seven hundred twenty-eight thousand, three hundred twenty".