Table:
|  |  | VMware Stock Options |  |  |
| --- | --- | --- | --- | --- |
|  | Outstanding Options | Exercise Price | Weighted- Average Remaining Contractual Term (in years) | Aggregate Intrinsic Value(1) |
| Exercisable | 945 | $47.24 | 3.81 | $95 |
| Vested and expected to vest | 2,589 | 56.13 | 6.41 | 238 |
Paragraphs:
Options outstanding that are exercisable and that have vested and are expected to vest as of January 31, 2020 were as follows (outstanding options in thousands, aggregate intrinsic value in in millions):
(1) The aggregate intrinsic values represent the total pre-tax intrinsic values based on VMware's closing stock price of $148.06 as of January 31, 2020, which would have been received by the option holders had all in-the-money options been exercised as of that date.
The total fair value of VMware stock options that vested during the years ended January 31, 2020, February 1, 2019 and February 2, 2018 was $64 million, $35 million and $32 million, respectively. Total fair value of Pivotal stock options that vested during the years ended January 31, 2020, February 1, 2019 and February 2, 2018 was $27 million, $41 million and $23 million, respectively.
The VMware stock options exercised during the years ended January 31, 2020, February 1, 2019 and February 2, 2018 had a pre-tax intrinsic value of $103 million, $56 million, and $62 million, respectively. The Pivotal options exercised during the years ended January 31, 2020 and February 1, 2019 had a pre-tax intrinsic value of $278 million and $97 million, respectively, and was not material during the year ended February 2, 2018. The pre-tax intrinsic value of Pivotal options exercised during the year ended January 31, 2020 includes vested options that were settled in cash as part of the Pivotal acquisition.
Question:
What was the difference between outstanding options that were exercisable and vested and expected to vest?
Answer: 2589-945 = 1644