On Sept 10th, Astra Zeneca paid out its September dividend.

https://www.astrazeneca.com/

It is 68.4p a share.

The total number of voting rights in AstraZeneca PLC is 1,266,776,325.

https://www.astrazeneca.com/investor-relations/Stock-exchange-announcements/2018/transparency-directive-voting-rights-and-capital01082018.html

Thus:

1,266,776,325 x £0.684 = £866,475,006.30

That is £866 Million

http://www.shareshop.hsbc.co.uk/shareshop/security.cgi?csi=10009

3.8% yield.