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77 in words

77

seventy-seven

77 is written seventy-seven.

Ways to write it

As an ordinal: seventy-seventh
Roman numeral: LXXVII
Expanded form: 70 + 7

Place value

Place	Digit	Value
tens	7	70
ones	7	7

Number facts

Even or odd: Odd
Prime or composite: Composite
Factors: 1, 7, 11 and 77 (4 factors)
First 10 multiples: 77, 154, 231, 308, 385, 462, 539, 616, 693, 770
Square: 77 × 77 = 5,929
Square root: ≈ 8.77
Sum of the digits: 7 + 7 = 14
Rounded to the nearest 10: 80
Number before: 76
Number after: 78
In binary: 1001101

Quick check

What number comes just after 77?
Show the answer
78
Is 77 even or odd?
Show the answer
Odd
What is 77 + 10?
Show the answer
87

Practice with a game

Count with Me

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Place Value Quest

Ones, tens, hundreds and thousands.

Times Tables Challenge

Practice any times table from 2× to 12×.

Frequently asked questions

How do you write 77 in words?

77 is written "seventy-seven".

Is 77 a prime number?

No. 77 is a composite number, because it has more than two factors.

What are the factors of 77?

The factors of 77 are 1, 7, 11 and 77.

How do you write 77 in Roman numerals?

77 in Roman numerals is LXXVII.