Alright, let's work through 78034257 times 71534117 step by step
78034257 × 71534117 = 71534117 × (78034257)
+ 71534117 × 7 that equals 500738819
+ 71534117 × 50 yielding 3576705850
+ 71534117 × 200 that is equal 14306823400
+ 71534117 × 4000 that results in 286136468000
+ 71534117 × 30000 resulting in 2146023510000
+ 71534117 × 000000 yielding 0
+ 71534117 × 8000000 that equals 572272936000000
+ 71534117 × 70000000 which equals 5007388190000000

= 5582111670246069
