No problem, we've got 5678921 and 4009428 to multiply
5678921 × 4009428 = 4009428 × (5678921)
+ 4009428 × 1 giving us 4009428
+ 4009428 × 20 which equals 80188560
+ 4009428 × 900 that equals 3608485200
+ 4009428 × 8000 that equals 32075424000
+ 4009428 × 70000 what gives us 280659960000
+ 4009428 × 600000 producing 2405656800000
+ 4009428 × 5000000 which equals 20047140000000

= 22769224867188
