Android - How to check the current platform of Android OS?
If you have adb set up, it's a one-liner at the shell prompt:
$ adb shell "getprop ro.product.cpu.abi"
In this example, the device asked answered that it has a 64bit ARM V8a CPU (second line).
Note: You can also run the quoted command in a terminal emulator running on the device / emulator. In there, it's just
CPU -Z is a versatile app that gives you SoC information apart from some other apps
From app description on play store