2026 is the real magic number in my estimation. That is the number of pledged delegates that will give either candidate the majority of pledged delegates and a rightful claim to the nomination. Given the current pledged delegate math, Sanders needs a minimum of 53.99% of the remaining pledged delegates to surpass 2026 and make a case to the super delegates to reverse course and support the candidate with the majority of pledged delegates. Of course if Sanders is unable to secure 54%, Clinton will be the nominee.
The point is purely a mathematical one and I am not claiming the super delegates are bound to do anything they don't want to do however I believe it would be a difficult argument for the super delegates to dismiss the will of the electorate regardless of which surpasses 2026.