No problem, we've got 84079974 and 64380638 to multiply
84079974 × 64380638 = 64380638 × (84079974)
+ 64380638 × 4 resulting in 257522552
+ 64380638 × 70 that results in 4506644660
+ 64380638 × 900 producing 57942574200
+ 64380638 × 9000 which equals 579425742000
+ 64380638 × 70000 giving us 4506644660000
+ 64380638 × 000000 that equals 0
+ 64380638 × 4000000 yielding 257522552000000
+ 64380638 × 80000000 producing 5150451040000000

= 5413122369143412
