To convert \( 2.7 \times 10^7 \) degrees Fahrenheit to decimal notation, you multiply 2.7 by \( 10^7 \), which is 10,000,000.
So:
\[ 2.7 \times 10^7 = 2.7 \times 10,000,000 = 27,000,000 \]
Thus, the temperature of the Sun at its center in decimal notation is 27,000,000 degrees Fahrenheit.