Alright, let's work through 72163015 times 62740878 step by step
72163015 × 62740878 = 62740878 × (72163015)
+ 62740878 × 5 what gives us 313704390
+ 62740878 × 10 what gives us 627408780
+ 62740878 × 000 which equals 0
+ 62740878 × 3000 which equals 188222634000
+ 62740878 × 60000 that is equal 3764452680000
+ 62740878 × 100000 resulting in 6274087800000
+ 62740878 × 2000000 that equals 125481756000000
+ 62740878 × 70000000 resulting in 4391861460000000

= 4527570920227170
