Here's how to write 149637000 in scientific notation:

1. Move the decimal point: Start by placing the decimal point after the first non-zero digit. In this case, we move it 8 places to the left: 1.49637000.

2. Count the decimal places: We moved the decimal point 8 places.

3. Exponent: Since we moved the decimal to the left, the exponent is positive. So, our exponent is 8.

4. Combine: The final answer is 1.49637 x 10⁸