Get image size in megapixels, total number of pixels, aspect ratio?

Is it possible to show total number of pixels, size in MP, aspect ratio of current featured image?

For example I use this to echo image dimensions of current featured image in post.

if ( has_post_thumbnail()) {
   $full_image_url = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'full');

// echo image width
echo $thumb_image_url[1];
// echo image height
echo $thumb_image_url[2];

And I get for example dimensions: 1600 x 1200.

Is possible to make function to calculate width x height to get total number of pixels?
(To get for example 1.920.000 = 1600*1200)

Also to transform total number of pixels in megapixels?
(To get for example 1.9 megapixels)

And, also function to calculate aspect ratio based on image width and height?
(1,33:1 = 4:3)