Alright, let's work through 87701394 times 78542142 step by step
87701394 × 78542142 = 78542142 × (87701394)
+ 78542142 × 4 what gives us 314168568
+ 78542142 × 90 that is equal 7068792780
+ 78542142 × 300 producing 23562642600
+ 78542142 × 1000 producing 78542142000
+ 78542142 × 00000 that equals 0
+ 78542142 × 700000 resulting in 54979499400000
+ 78542142 × 7000000 resulting in 549794994000000
+ 78542142 × 80000000 which equals 6283371360000000

= 6888255341145948
