seven7777 in English Words. We generally write numbers in words using the English alphabet. Thus, we can spell 77 using the words in English as Seventy-seven. How to Write 77 in Words? As weThus, the correct spelling of 77 is seventy-seven (hyphenated). Along the same s: 77,000 = seventy-seven thousand (hyphenated). 77,000,000 = seventy-seven million