About how many times as great is 1.7 × 106 than 3.5 × 105?

1.7 × 10^6 is about 4.85 times as great as 3.5 × 10^5.

To calculate this, divide 1.7 × 10^6 by 3.5 × 10^5:

(1.7 × 10^6) / (3.5 × 10^5) ≈ 4.85

So, 1.7 × 10^6 is about 4.85 times as great as 3.5 × 10^5.