Alright, let's work through 77457820 times 54458766 step by step
77457820 × 54458766 = 54458766 × (77457820)
+ 54458766 × 0 yielding 0
+ 54458766 × 20 that equals 1089175320
+ 54458766 × 800 that results in 43567012800
+ 54458766 × 7000 producing 381211362000
+ 54458766 × 50000 that is equal 2722938300000
+ 54458766 × 400000 that equals 21783506400000
+ 54458766 × 7000000 resulting in 381211362000000
+ 54458766 × 70000000 that is equal 3812113620000000

= 4218257294250120
