Any optimizations I could do for my number abreviator?

Help and Feedback Code Review
#1

Ive made my own number abreviator(1234 to 1.234 K). It can convert numbers like 10342344 to 10 M and can convert scientific notation into a abbreviated number aswell. It works really well but I wonder if I could add any optimizations?

SCRIPT:

function abreviate(number)
	local abreviations = {
		[3] = "K",
		[6] = "M",
		[9] = "B",
		[12] = "T",
		[15] = "Qa",
		[18] = "Qi",
		[21] = "Sx",
		[24] = "Se",
		[27] = "Oc",
		[30] = "Nn"
	}
	if number < 1000 then
		return number
	elseif string.find(tostring(number),"e+") then
		local split = string.split(tostring(number),"e+")
		if split[1] and split[2] then
			local power = tonumber(split[2])
			if power then
				local abreviation = power - (power % 3)
				local truepre = tonumber(split[1])
				if truepre then
					local preAb = tostring(truepre * (10^(power-(abreviation)))) .. " "
					return preAb .. abreviations[abreviation]
				end
			else
				return number
			end
		end
	elseif not string.find(tostring(number),"e+") then
		local num = tostring(math.floor(number))
		local length = #num
		local trueLength = #num % 3
		if trueLength == 0 then
			trueLength = 3
		end
		local abreviation = abreviations[length-trueLength]
		if abreviation then
			local startNum = string.sub(num, 1, trueLength) .. "."
			local decimals = string.sub(num, trueLength+1,trueLength+2) .. " "
			if startNum and decimals then
				return startNum .. decimals .. abreviation
			else
				return number
			end
		else
			return number
		end
	end
end
#2

The second elseif, specifically elseif not string.find(tostring(number),"e+") then, should be rewritten just as else. When a number is over 1,000 and is less than e+, it’ll do a second check to make sure it’s less than e+ which is unnecessary because you just checked.

You’re also creating a local variable called preAb and then just returning it andn ot using it for anything else other than that, you can cut out the middle man.

#3

I see your points and I like them. I had the var preAb that meant pre abbreviation like the 52.42 of 52.42 K.

I wanted it to look cleaner.