That depends on the type material you are referring to. Also, these are two different types of measurements. Gallons is a measure of volume but the other is weight or mass. Please edit your question to include more context or details.
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One gallon of plain water weighs about 8.35 pounds which converts to 3,787,000 milligrams.
Assuming mg is milligrams (the standard abbreviation) the answer is none. A milligram is a measure of mass. A gallon is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a gallon of air. How many milligrams? Next consider a gallon of molten lead. How many milligrams?
One gallon
This is another question asking us to compare units of different quantities. Milligram is a unit of mass (or weight), and gallon is a unit of capacity (volume). There is no answer. You might as well ask how many ounces are in an inch.
There are 1000 milligrams in one gram. Therefore, 27000 milligrams is equal to 27000/1000 = 27 grams.