Check the md5sum. To do that, open a terminal on the directory where you have downloaded the ISO and run:
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Compare the output with the one on the download page, which zerozero has copied above.
Also note that on the website, though it says the file size is "879MB" it should actually say "879MiB". Your file browser, with which you probably looked up the size of the downloaded file, may either show the size of a file in MB units or in MiB units. The difference is that 1 MB = 1,000,000 bytes (1000 ^ 2) and 1 MiB = 1048576 bytes (1024 ^ 2). Though this doesn't explain the difference in size you saw, it makes it clear that unless you have the exact byte count you can't really depend on checking a file by size like this. Compare the md5sum and know for sure.