the series 840, 560, 420, 336, 280, 240

Please complete the pyramid by replacing '?' with the correct number?

1 1 1 2 1 1 2 1 1 1 1 1 2 2 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ?

What number should replace the question mark?

42 - - - 170 93 - - - 840 18 - - - 26 54 - - - 274 67 - - - ??

We are given a positive integer N. Two of its positive divisors are chosen and the differences between N and these two divisors are 270 and 280 respectively.

Find the number of possible value(s) of N?