Alright, let's work through 72063709 times 3528643 step by step
72063709 × 3528643 = 3528643 × (72063709)
+ 3528643 × 9 resulting in 31757787
+ 3528643 × 00 yielding 0
+ 3528643 × 700 producing 2470050100
+ 3528643 × 3000 yielding 10585929000
+ 3528643 × 60000 that results in 211718580000
+ 3528643 × 000000 giving us 0
+ 3528643 × 2000000 resulting in 7057286000000
+ 3528643 × 70000000 that is equal 247005010000000

= 254287102316887
