Alright, let's work through 77498134 times 9621509 step by step
77498134 × 9621509 = 9621509 × (77498134)
+ 9621509 × 4 that is equal 38486036
+ 9621509 × 30 resulting in 288645270
+ 9621509 × 100 which equals 962150900
+ 9621509 × 8000 that is equal 76972072000
+ 9621509 × 90000 that results in 865935810000
+ 9621509 × 400000 giving us 3848603600000
+ 9621509 × 7000000 resulting in 67350563000000
+ 9621509 × 70000000 resulting in 673505630000000

= 745648993764206
