Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: purchases of equity securities 2013 during 2018 , we repurchased 57669746 shares of our common stock at an average price of $ 143.70 . the following table presents common stock repurchases during each month for the fourth quarter of 2018 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares remaining under the plan or program [b] . <table class='wikitable'><tr><td>1</td><td>period</td><td>total number of shares purchased [a]</td><td>average price paid per share</td><td>total number of shares purchased as part of a publicly announcedplan or program [b]</td><td>maximum number of shares remaining under the plan or program [b]</td></tr><tr><td>2</td><td>oct . 1 through oct . 31</td><td>6091605</td><td>$ 158.20</td><td>6087727</td><td>32831024</td></tr><tr><td>3</td><td>nov . 1 through nov . 30</td><td>3408467</td><td>147.91</td><td>3402190</td><td>29428834</td></tr><tr><td>4</td><td>dec . 1 through dec . 31</td><td>3007951</td><td>148.40</td><td>3000715</td><td>26428119</td></tr><tr><td>5</td><td>total</td><td>12508023</td><td>$ 153.04</td><td>12490632</td><td>n/a</td></tr></table> [a] total number of shares purchased during the quarter includes approximately 17391 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares . [b] effective january 1 , 2017 , our board of directors authorized the repurchase of up to 120 million shares of our common stock by december 31 , 2020 . these repurchases may be made on the open market or through other transactions . our management has sole discretion with respect to determining the timing and amount of these transactions. .
Question: what was the total number of shares repurchased in 2018, in millions?

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