Alright, let's work through 12640045 times 59864154 step by step
12640045 × 59864154 = 59864154 × (12640045)
+ 59864154 × 5 resulting in 299320770
+ 59864154 × 40 producing 2394566160
+ 59864154 × 000 resulting in 0
+ 59864154 × 0000 that is equal 0
+ 59864154 × 40000 yielding 2394566160000
+ 59864154 × 600000 that results in 35918492400000
+ 59864154 × 2000000 that equals 119728308000000
+ 59864154 × 10000000 that equals 598641540000000

= 756685600446930
