Alright, let's work through 72658187 times 72156425 step by step
72658187 × 72156425 = 72156425 × (72658187)
+ 72156425 × 7 that equals 505094975
+ 72156425 × 80 that equals 5772514000
+ 72156425 × 100 that is equal 7215642500
+ 72156425 × 8000 giving us 577251400000
+ 72156425 × 50000 what gives us 3607821250000
+ 72156425 × 600000 that results in 43293855000000
+ 72156425 × 2000000 giving us 144312850000000
+ 72156425 × 70000000 producing 5050949750000000

= 5242755020901475
