Alright, let's work through 84438757 times 43507797 step by step
84438757 × 43507797 = 43507797 × (84438757)
+ 43507797 × 7 resulting in 304554579
+ 43507797 × 50 producing 2175389850
+ 43507797 × 700 producing 30455457900
+ 43507797 × 8000 that is equal 348062376000
+ 43507797 × 30000 yielding 1305233910000
+ 43507797 × 400000 which equals 17403118800000
+ 43507797 × 4000000 that is equal 174031188000000
+ 43507797 × 80000000 which equals 3480623760000000

= 3673744298488329
