Alright, let's work through 78354993 times 1245771 step by step
78354993 × 1245771 = 1245771 × (78354993)
+ 1245771 × 3 yielding 3737313
+ 1245771 × 90 yielding 112119390
+ 1245771 × 900 that is equal 1121193900
+ 1245771 × 4000 that is equal 4983084000
+ 1245771 × 50000 giving us 62288550000
+ 1245771 × 300000 which equals 373731300000
+ 1245771 × 8000000 yielding 9966168000000
+ 1245771 × 70000000 what gives us 87203970000000

= 97612377984603
