Alright, let's work through 64716739 times 71586471 step by step
64716739 × 71586471 = 71586471 × (64716739)
+ 71586471 × 9 producing 644278239
+ 71586471 × 30 that is equal 2147594130
+ 71586471 × 700 producing 50110529700
+ 71586471 × 6000 producing 429518826000
+ 71586471 × 10000 that is equal 715864710000
+ 71586471 × 700000 resulting in 50110529700000
+ 71586471 × 4000000 what gives us 286345884000000
+ 71586471 × 60000000 producing 4295188260000000

= 4632842959638069
