Alright, let's work through 72168973 times 64809037 step by step
72168973 × 64809037 = 64809037 × (72168973)
+ 64809037 × 3 that equals 194427111
+ 64809037 × 70 which equals 4536632590
+ 64809037 × 900 giving us 58328133300
+ 64809037 × 8000 that is equal 518472296000
+ 64809037 × 60000 resulting in 3888542220000
+ 64809037 × 100000 that is equal 6480903700000
+ 64809037 × 2000000 which equals 129618074000000
+ 64809037 × 70000000 that results in 4536632590000000

= 4677201641409001
