DRUG CLASS AND MECHANISM: Rosuvastatin is an oral drug for lowering blood cholesterol levels. It belongs to a class of drugs called HMG-CoA reductase inhibitors, more commonly referred to as  statins ..RUG CLASS AND MECHANISM: Rosuvastatin is an oral drug for lowering blood cholesterol levels. It belongs to a class of drugs called HMG-CoA reductase inhibitors, more commonly referred to as  statins ..
Natural numbers are naturally used for counting apples (and other things) so they are sometimes called counting numbers. Even some animals other than humans can count and add, so they must be natural. Minus two apples isn't very natural so negative numbers are not included.
The integer n = 6 has the proper divisors 1,2,3. The sum of these divisors is 6, the number itself. A natural number n for which the sum of proper divisors is n is called a perfect number. So, 6. is a perfect number. All presently known perfect numbers are even. Here are the smallest 12 perfect numbers: 6,28,496,8128,33550336,8589869056,137438691328.