You have it in reverse. Scientific notation is useful for measuring stars.
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In scientific notation - it would be 5.22x106
778412020 in scientific notation is: 7.78412 × 108
Because if they did not, then it would not have been called scientific notation!
Scientific notation is especially useful if you use very large numbers, or very small numbers (numbers close to zero). I am not sure whether biologists commonly use such numbers, though.
The scientific notation for 269000 would be 2.69 x 105.