Alright, let's work through 78467964 times 64185793 step by step
78467964 × 64185793 = 64185793 × (78467964)
+ 64185793 × 4 that equals 256743172
+ 64185793 × 60 resulting in 3851147580
+ 64185793 × 900 that is equal 57767213700
+ 64185793 × 7000 that results in 449300551000
+ 64185793 × 60000 producing 3851147580000
+ 64185793 × 400000 what gives us 25674317200000
+ 64185793 × 8000000 resulting in 513486344000000
+ 64185793 × 70000000 producing 4493005510000000

= 5036528494435452
