Highly Composite Numbers (HCN)
A positive integer n is called a highly composite number if it has more
divisors than any predecessor.
The concept of HCN was introduced by Srinivasa Ramanujan in 1915. Here are excerpts from his paper
(Proceedings of the London Mathematical Society, 2, xiv, 1915, 347-409):
Input a number n (up to 20 digits), and this calculator will check if n is highly composite. Enjoy!