11665728000 has 640 divisors, whose sum is σ = 44378231040. Its totient is φ = 3019161600.

The previous prime is 11665727993. The next prime is 11665728037. The reversal of 11665728000 is 82756611.

11665728000 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 572 + 80 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74303922 + ... + 74304078.

It is an arithmetic number, because the mean of its divisors is an integer number (69340986).

Almost surely, 2^11665728000 is an apocalyptic number.

11665728000 is a gapful number since it is divisible by the number (10) 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 11665728000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22189115520).

11665728000 is an abundant number, since it is smaller than the sum of its proper divisors (32712503040).

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

11665728000 is an equidigital number, since it uses as much as digits as its factorization.

11665728000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 11665728000 in words is "eleven billion, six hundred sixty-five million, seven hundred twenty-eight thousand".