Alright, let's work through 87691189 times 78388896 step by step
87691189 × 78388896 = 78388896 × (87691189)
+ 78388896 × 9 that equals 705500064
+ 78388896 × 80 that is equal 6271111680
+ 78388896 × 100 what gives us 7838889600
+ 78388896 × 1000 that is equal 78388896000
+ 78388896 × 90000 that equals 7055000640000
+ 78388896 × 600000 that equals 47033337600000
+ 78388896 × 7000000 what gives us 548722272000000
+ 78388896 × 80000000 that results in 6271111680000000

= 6874015494637344
