FRANKFURT (Reuters) - Klaus Tschira, one of the co-founders of European software giant SAP (>> SAP SE), has died unexpectedly at the age of 74, his foundation said on Tuesday.

Tschira, a trained physicist, left IBM (>> International Business Machines Corp.) to found SAP in 1972 together with four IBM colleagues: Hasso Plattner, who is still the company's chairman, Dietmar Hopp, Hans-Werner Hector and Claus Wellenreuther.

The German business software company began by developing software that could process data in real time rather than overnight in batches, and went public in 1988.

It is now Europe's biggest technology company, with revenue of 17.6 billion euros (12.77 billion pounds), market capitalisation of 82.3 billion euros and more than 74,000 employees in 2014.

Tschira, a billionaire, stepped down from SAP's supervisory board in 2007.

He was married to Gerda Tschira and had two sons.

(Reporting by Georgina Prodhan)

Stocks treated in this article : International Business Machines Corp., SAP SE