No problem, we've got 71802587 and 70639113 to multiply
71802587 × 70639113 = 70639113 × (71802587)
+ 70639113 × 7 resulting in 494473791
+ 70639113 × 80 what gives us 5651129040
+ 70639113 × 500 producing 35319556500
+ 70639113 × 2000 giving us 141278226000
+ 70639113 × 00000 giving us 0
+ 70639113 × 800000 which equals 56511290400000
+ 70639113 × 1000000 yielding 70639113000000
+ 70639113 × 70000000 producing 4944737910000000

= 5072071056785331
