Number reference
625 explained.
625: six hundred twenty-five, composite, perfect square; factors, prime factorization, roots, binary, hexadecimal, and digit properties.
Identity and representations
- Written form
- six hundred twenty-five
- Classification
- composite
- Factors
- 1, 5, 25, 125, 625
- Prime factorization
- 5 × 5 × 5 × 5
- Square root
- 25
- Cube root
- 8.54988
- Binary
- 1001110001
- Octal
- 1161
- Hexadecimal
- 271
- Roman numeral
- DCXXV
- Digit sum
- 13
- Digital root
- 4
What makes 625 notable
- Perfect square. 625 = 25², so a square of side 25 has an area of 625.
625 in everyday use
Six hundred twenty-five is five to the fourth power and 25 squared, and it is the number of lines in the analogue television standards used across Europe, Africa, Asia, and Australia for half a century. PAL and SECAM pictures were built from 625 lines scanned 25 times a second, against 525 lines in the Americas and Japan, and the figure stayed in use until digital switchover. As a decimal, 0.0625 is one sixteenth, so 625 turns up wherever things are halved four times.
The number is automorphic: its square, 390,625, ends in the digits 625, and so does every higher power of it. Only two three-digit numbers have that property, 376 and 625, and they are linked by adding to 1,001. Factored it is simply 5⁴, with five divisors: 1, 5, 25, 125, and 625. It is 1001110001 in binary and 271 in hexadecimal, and its digit sum is 13.
Nearby numbers
How to read this page
The factor list shows every way 625 splits into equal whole-number groups — 5 divisors in total. The prime factorisation is the compact form of that same information, and the base conversions restate 625 for contexts that do not use decimal.
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