The notation "1.78E12" is a way to express a number in scientific notation. It means that the number is \( 1.78 \times 10^{12} \). This indicates that the value displayed on Charlee's calculator is 1.78 multiplied by 10 raised to the power of 12.
In standard form, this is equivalent to:
\[ 1.78 \times 10^{12} = 1,780,000,000,000 \]
Therefore, the calculator is showing that the product of the two large numbers is 1.78 trillion, or 1,780 billion.