Hello Justin,
I know about those numbers, but it was nice to memorize them again.
I can tell you some more information about that ( you might already know it though) and correct some aspects:
Number 2:
is a good number in Chinese culture, they say 'good things come in pairs'. Therefore it is common to use double symbols in product brand names like double coins , double elephants etc.
Number 3:
Sounds like the character of birth "生" sheng ..saang ,, and is therefore considered a lucky number as well.
Number 5:
It refers to the 5 elements (water,fire,air,earth and metal) in Chinese philosophy, It also refers to the pronoun "I".
You know the Chinese "I" is 'wo' 我,and it sounds a bit like 'wu' .
Number 9:
The number 9 (九, Pinyin: jiŭ, jyutping: gau2), being the greatest of single-digit numbers, was historically associated with the Emperor of China; the Emperor's robes often had nine dragons, and Chinese mythology held that the dragon has nine children.
Moreover, the number 9 is a homophone of the word for "longlasting" (久), and as such is often used in weddings.
7456:
This number " qi si wu liu" sounds a bit like " 氣死我了"qisi wo le ",which means "to make me angry or piss me off".So it means 'you make me angry or you piss me off"
520 or 521 :
means 'i love you'
5= wu 2=er 1 = yi similar to 'wo ai ni' 我爱你
So now you know the meaning of :
" 7456 但是521“
88 ;)