The number 70742
70742 is a composite number with 16 divisors. Its prime factorisation is 2 × 7 × 31 × 163. Divisors (16): 1, 2, 7, 14, 31, 62, 163, 217, 326, 434, 1141, 2282, 5053, 10106, 35371, 70742.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
70742 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
70742 is composite. Its prime factorisation is
- 3
The divisors add up to 125952; without 70742 itself that is 55210, so 70742 is deficient (55210 is less than 70742). Euler's totient φ(70742) = 29160 numbers up to 70742 share no factor with it.
- 4
The digits of 70742 add up to 20, and repeating that until one digit is left gives the digital root 2. The Collatz sequence (halve if even, else 3n+1) takes 81 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70742 = 2 \times 7 \times 31 \times 163 \]
70742 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 16 |
| Sum of divisors | 125952 |
| Euler totient φ(n) | 29160 |
| Square | 5004430564 |
| Cube | 354023426958488 |
| Square root | 265.973683 |
| Digit sum / digital root | 20 / 2 |
| Collatz steps to 1 | 81 |
| Scientific notation | 7.0742 × |
70742 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand seven hundred and forty-two |
| Binary (base 2) | 10001010001010110 |
| Octal (base 8) | 212126 |
| Hexadecimal (base 16) | 11456 |
| Base 3 | 10121001002 |
| As time | 70742 seconds = 19 h 39 min 2 s |
Is 70742 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (70742 ÷ 2 = 35371) | 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 2) | 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 | Yes (70742 ÷ 7 = 10106) | 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 6) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 2) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 2) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 1) | 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 70742 a prime number?
No. 70742 = 2 × 7 × 31 × 163, so it is divisible by 2.
What are the factors of 70742?
1, 2, 7, 14, 31, 62, 163, 217, 326, 434, 1141, 2282, 5053, 10106, 35371, 70742.
What is 70742 in binary?
10001010001010110 (hexadecimal 11456, octal 212126).
What is the square root of 70742?
About 265.9737.
Is 70742 divisible by 3?
No. Its digits add up to 20, which is not a multiple of 3.
What is special about the number 70742?
It is a composite number with 16 divisors.