31 gigabytes = 31,744 megabytes
1 GB is equal to 1024 (or 2^10) MB, so it is about 31 GB.
Most apps, not including their data, are between 2 to 32 MB in size. If your 31 apps are 2 MB in size, they would take up 64 MB (0.078%) of your 8 GB storage (you consider 8 GB as 8192 MB, not 8000 MB). If your apps are 4 MB in size, they take up 128 MB (1.56%) of 8 GB. 8 MB apps take up 256 MB (3.125%) of 8 GB. 16 MB apps take up 512 MB (6.25%) of 8 GB. So, even at 31 apps, it doesn't take up much space by itself.
1024 megabytes= 1 gigabyte
289 megabytes = 0.28 gigabytes
145.60 megabytes = 0.1421875 gigabytes
That would be 2 megabytes which in today's world isn't very much. Instead of MB, do you mean GB which is gigabytes? 2 gigabytes is 2048 megabytes.
A gigabyte is 1024 megabytes.
One gigabyte (gb) is equal to 1024 megabytes (mb).
!000 Mb to a Gb. Therefore, 3.476GB
83 MB is about 0.081 GB
8,000 mb
2048 mb