Alright, let's work through 7639 times 8877 step by step
7639 × 8877 = 8877 × (7639)
+ 8877 × 9 resulting in 79893
+ 8877 × 30 what gives us 266310
+ 8877 × 600 giving us 5326200
+ 8877 × 7000 that results in 62139000

= 67811403
