8,515

[Math.]  A triangular number (sum of all integers from 1 to 130): 8515 = 1+2+…+129+130.

 

8,555

[Math.]  A pyramidal number (sum of all squares of integers from 1 to 29): 8555 = 12+22+…+282+292.

 

8,578

[Math.]  85784 = 5,414,323,085,783,056.