Alright, let's work through 64147058 times 12712380 step by step
64147058 × 12712380 = 12712380 × (64147058)
+ 12712380 × 8 resulting in 101699040
+ 12712380 × 50 which equals 635619000
+ 12712380 × 000 yielding 0
+ 12712380 × 7000 what gives us 88986660000
+ 12712380 × 40000 resulting in 508495200000
+ 12712380 × 100000 which equals 1271238000000
+ 12712380 × 4000000 that is equal 50849520000000
+ 12712380 × 60000000 that equals 762742800000000

= 815461777178040
