No problem, we've got 64314644 and 84329839 to multiply
64314644 × 84329839 = 84329839 × (64314644)
+ 84329839 × 4 resulting in 337319356
+ 84329839 × 40 yielding 3373193560
+ 84329839 × 600 that is equal 50597903400
+ 84329839 × 4000 yielding 337319356000
+ 84329839 × 10000 which equals 843298390000
+ 84329839 × 300000 yielding 25298951700000
+ 84329839 × 4000000 that equals 337319356000000
+ 84329839 × 60000000 producing 5059790340000000

= 5423643573862316
