Assuming that you store text-number in column "A"... do the following trick: select column "B" and format cells as scientific, then use formula:
RowNo A B
1 28009105740071330 =A1
Then, fill down the formula.
Note: do not forget to increase width of column "B" before you start adding formula!
Result:
A B
28009105740071330 28009105740071330