Alright, let's work through 78040091 times 34187093 step by step
78040091 × 34187093 = 34187093 × (78040091)
+ 34187093 × 1 which equals 34187093
+ 34187093 × 90 that equals 3076838370
+ 34187093 × 000 giving us 0
+ 34187093 × 0000 giving us 0
+ 34187093 × 40000 that results in 1367483720000
+ 34187093 × 000000 yielding 0
+ 34187093 × 8000000 which equals 273496744000000
+ 34187093 × 70000000 producing 2393096510000000

= 2667963848745463
