The difference between the greatest and least number is the range.
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The range
The greatest common factor of two (or more) integers is the biggest whole number that divides into each one of them. The least common factor is the smallest whole number that divides into each one of them and must be 1. Very possibly, you meant the least common multiple, however?
The least common multiple, or LCM, is the smallest integer that all the members of a given set of numbers will divide into evenly with no remainder. The greatest common multiple is infinite.
greatest = 2,499,999 and least = 1,500,000
19 x 41 = 779