Highly composite numbers
On the opposite extreme from the primes are the highly composite numbers. The primes have the least quantity of factors, namely two. A highly composite number is one which has the greatest quantity of factors compared to any lesser number. In other words, the highly composite numbers each initiate an increase in quantity of factors over that of any lesser number.
For example, every number above 180 has less factors than has 180, until you get to 240. Then, 240 has an additional two factors over 180. Then, no number above 240 has more factors than 240, until you get to 360, while the quantity of factors of 336 mere equals that of 240.
Additionally, the key factor for all highly composite numbers beginning with 12 is 12. So, every highly composite number greater than 12 is divisible by twelve. And, otherwise, there is no single number (except, of course, 1) by which all highly composite numbers are divisible.