Alright, let's work through 87849447 times 77753428 step by step
87849447 × 77753428 = 77753428 × (87849447)
+ 77753428 × 7 yielding 544273996
+ 77753428 × 40 producing 3110137120
+ 77753428 × 400 producing 31101371200
+ 77753428 × 9000 that is equal 699780852000
+ 77753428 × 40000 which equals 3110137120000
+ 77753428 × 800000 what gives us 62202742400000
+ 77753428 × 7000000 resulting in 544273996000000
+ 77753428 × 80000000 that is equal 6220274240000000

= 6830595652154316
