[Ammako]

This is something I do to format numbers and group into thousands/millions.

local function formatPlayerNumbers(amount)
    local formatted, k = amount
 
    if amount >= 100000 and amount < 100000000 then
        formatted = string.sub(formatted, 0, (string.len(formatted) - 3)) .. " K"
    elseif amount >= 100000000 then
        formatted = string.sub(formatted, 0, (string.len(formatted) - 6)) .. " M"
    else
        while true do  
            formatted, k = string.gsub(formatted, "^(-?%d+)(%d%d%d)", '%1,%2')
            if (k==0) then
                break
            end
        end
    end
 
    return formatted
end

Of course, you'll have to tweak the amounts at lines 4 and 6 to get it to shorten 5,000,000 as 5M rather than 5,000K, but you get the point.