Alright, let's work through 87070811 times 6376928 step by step
87070811 × 6376928 = 6376928 × (87070811)
+ 6376928 × 1 producing 6376928
+ 6376928 × 10 producing 63769280
+ 6376928 × 800 that results in 5101542400
+ 6376928 × 0000 resulting in 0
+ 6376928 × 70000 what gives us 446384960000
+ 6376928 × 000000 resulting in 0
+ 6376928 × 7000000 giving us 44638496000000
+ 6376928 × 80000000 that results in 510154240000000

= 555244292648608
