Alright, let's work through 53075133 times 12788738 step by step
53075133 × 12788738 = 12788738 × (53075133)
+ 12788738 × 3 yielding 38366214
+ 12788738 × 30 that equals 383662140
+ 12788738 × 100 that equals 1278873800
+ 12788738 × 5000 yielding 63943690000
+ 12788738 × 70000 giving us 895211660000
+ 12788738 × 000000 producing 0
+ 12788738 × 3000000 giving us 38366214000000
+ 12788738 × 50000000 that results in 639436900000000

= 678763970252154
