Number reference
720 explained.
720: seven hundred twenty, composite, factorial; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- seven hundred twenty
- Classification
- composite
- Factors
- 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 36, 40, 45, 48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
- Prime factorization
- 2 × 2 × 2 × 2 × 3 × 3 × 5
- Square root
- 26.832816
- Cube root
- 8.962809
- Binary
- 1011010000
- Octal
- 1320
- Hexadecimal
- 2D0
- Roman numeral
- DCCXX
- Digit sum
- 9
- Digital root
- 9
What makes 720 notable
- Factorial. 720 = 6! — the product of every whole number from 1 to 6. It counts the ways 6 distinct items can be put in order.
- Highly composite. 720 has 30 divisors — more than any smaller positive number. That is why numbers like this get chosen for units of time, angle, and packaging.
720 in everyday use
Seven hundred twenty is six factorial, the number of ways to order six items, and it is the number of degrees in two full turns, which is why a skater's double rotation is a "720". The interior angles of any hexagon add to 720 degrees. On screens it labels 720p, the 1280 × 720 high-definition format, and 720 pixels was for years the vertical resolution of broadcast HD. There are 720 minutes in twelve hours and 720 hours in a thirty-day month.
It is a highly composite number, with thirty divisors, more than any smaller number, and it factors as 2⁴ × 3² × 5. It is also 6 × 5!, 3! × 5!, and 2 × 360, and the product of the first six positive integers. Because it has so many divisors it appears in old systems of weights and coinage. It is 1011010000 in binary and 2D0 in hexadecimal, and its digit sum is 9.
Nearby numbers
How to read this page
The factor list shows every way 720 splits into equal whole-number groups — 30 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 720 for contexts that do not use decimal.
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