Alright, let's work through 87721476 times 61528537 step by step
87721476 × 61528537 = 61528537 × (87721476)
+ 61528537 × 6 resulting in 369171222
+ 61528537 × 70 resulting in 4306997590
+ 61528537 × 400 which equals 24611414800
+ 61528537 × 1000 that is equal 61528537000
+ 61528537 × 20000 which equals 1230570740000
+ 61528537 × 700000 which equals 43069975900000
+ 61528537 × 7000000 which equals 430699759000000
+ 61528537 × 80000000 that equals 4922282960000000

= 5397374081760612
