Alright, let's work through 72891022 times 51869335 step by step
72891022 × 51869335 = 51869335 × (72891022)
+ 51869335 × 2 resulting in 103738670
+ 51869335 × 20 producing 1037386700
+ 51869335 × 000 that results in 0
+ 51869335 × 1000 resulting in 51869335000
+ 51869335 × 90000 giving us 4668240150000
+ 51869335 × 800000 resulting in 41495468000000
+ 51869335 × 2000000 yielding 103738670000000
+ 51869335 × 70000000 giving us 3630853450000000

= 3780808838610370
