Let's break down the expression step by step.

Calculate ( 87 \times 39 ):
[
87 \times 39 = 3393
]

Calculate ( 5000 - 3393 ):
[
5000 - 3393 = 1607
]

Calculate ( 600 \times 504 ):
[
600 \times 504 = 302400
]

Calculate ( 302400 - 295200 ):
[
302400 - 295200 = 7200
]

Now, we have ( (1607) \times (7200) ). Calculate this:
[
1607 \times 7200 = 11546400
]

Now, divide ( 11546400 ) by ( 80 ):
[
\frac{11546400}{80} = 143830
]

Calculate ( 38 \times 9520 ):
[
38 \times 9520 = 361760
]

Add the results from step 6 and step 7:
[
143830 + 361760 = 505590
]

So, the final result is:
[
\boxed{505590}
]