Alright, let's work through 71944865 times 87666839 step by step
71944865 × 87666839 = 87666839 × (71944865)
+ 87666839 × 5 that is equal 438334195
+ 87666839 × 60 that equals 5260010340
+ 87666839 × 800 that equals 70133471200
+ 87666839 × 4000 what gives us 350667356000
+ 87666839 × 40000 yielding 3506673560000
+ 87666839 × 900000 resulting in 78900155100000
+ 87666839 × 1000000 yielding 87666839000000
+ 87666839 × 70000000 yielding 6136678730000000

= 6307178896831735
