The number 698
698 is a composite number with 4 divisors. Its prime factorisation is 2 × 349. Divisors (4): 1, 2, 349, 698.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 698: a semiprime: 2 × 349, the product of two primes.
- 2
698 is composite. Its prime factorisation is
- 3
The divisors add up to 1050; without 698 itself that is 352, so 698 is deficient (352 is less than 698). Euler's totient φ(698) = 348 numbers up to 698 share no factor with it.
- 4
The digits of 698 add up to 23, and repeating that until one digit is left gives the digital root 5. The Collatz sequence (halve if even, else 3n+1) takes 33 steps to reach 1.
LaTeX source of the formulas on this page
\[ 698 = 2 \times 349 \]
698 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 4 |
| Sum of divisors | 1050 |
| Euler totient φ(n) | 348 |
| Square | 487204 |
| Cube | 340068392 |
| Square root | 26.419690 |
| Digit sum / digital root | 23 / 5 |
| Collatz steps to 1 | 33 |
| Scientific notation | 6.98 × |
698 in other forms
| Form | Value |
|---|---|
| In words | six hundred and ninety-eight |
| Roman numerals | DCXCVIII |
| Binary (base 2) | 1010111010 |
| Octal (base 8) | 1272 |
| Hexadecimal (base 16) | 2BA |
| Base 3 | 221212 |
| As time | 698 seconds = 11 min 38 s |
Is 698 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (698 ÷ 2 = 349) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 2) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 2) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 2) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 5) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 2) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 5) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 5) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 2) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 698 a prime number?
No. 698 = 2 × 349, so it is divisible by 2.
What are the factors of 698?
1, 2, 349, 698.
What is 698 in binary?
1010111010 (hexadecimal 2BA, octal 1272).
What is the square root of 698?
About 26.4197.
What is 698 in Roman numerals?
DCXCVIII.
Is 698 divisible by 3?
No. Its digits add up to 23, which is not a multiple of 3.
What is special about the number 698?
698 is a semiprime: 2 × 349, the product of two primes.