Seven hundred and eighty-eight ($788) is spelled out in numerical form as:
7-8-8
In words, it would be written out as "seven hundred eighty-eight dollars" ($788).
When writing out a large amount of money, the traditional practice is to use the long form, such as:
Seven hundred eighty-eight and no/100 Dollars ($788.00)
However, the preferred style in an informal setting, or in an online or digital context, is to spell out the full amount in numerical form, such as:
Seven hundred eighty-eight dollars and no cents ($788.00)
For additional guidance regarding how to properly spell out numerical amounts, you can refer to this useful article from Grammarly: https://www.grammarly.com/blog/how-to-express-numbers-in-writing/.
