Alright, let's work through 19748892 times 78209904 step by step
19748892 × 78209904 = 78209904 × (19748892)
+ 78209904 × 2 that results in 156419808
+ 78209904 × 90 what gives us 7038891360
+ 78209904 × 800 giving us 62567923200
+ 78209904 × 8000 giving us 625679232000
+ 78209904 × 40000 resulting in 3128396160000
+ 78209904 × 700000 that results in 54746932800000
+ 78209904 × 9000000 that is equal 703889136000000
+ 78209904 × 10000000 that is equal 782099040000000

= 1544558947426368
