No problem, we've got 345679 and 15625606 to multiply
345679 × 15625606 = 15625606 × (345679)
+ 15625606 × 9 producing 140630454
+ 15625606 × 70 what gives us 1093792420
+ 15625606 × 600 that is equal 9375363600
+ 15625606 × 5000 giving us 78128030000
+ 15625606 × 40000 that is equal 625024240000
+ 15625606 × 300000 yielding 4687681800000

= 5401443856474
