Alright, let's work through 72075296 times 66811322 step by step
72075296 × 66811322 = 66811322 × (72075296)
+ 66811322 × 6 that equals 400867932
+ 66811322 × 90 resulting in 6013018980
+ 66811322 × 200 that results in 13362264400
+ 66811322 × 5000 that equals 334056610000
+ 66811322 × 70000 that is equal 4676792540000
+ 66811322 × 000000 giving us 0
+ 66811322 × 2000000 that is equal 133622644000000
+ 66811322 × 70000000 what gives us 4676792540000000

= 4815445809301312
