The number 70425
70425 is a composite number with 18 divisors. Its prime factorisation is × × 313. Divisors (18): 1, 3, 5, 9, 15, 25, 45, 75, 225, 313, 939, 1565, 2817, 4695, 7825, 14085 … 70425.
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How to work it out
- 1
What is special about 70425: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
70425 is composite. Its prime factorisation is
- 3
The divisors add up to 126542; without 70425 itself that is 56117, so 70425 is deficient (56117 is less than 70425). Euler's totient φ(70425) = 37440 numbers up to 70425 share no factor with it.
- 4
The digits of 70425 add up to 18, and repeating that until one digit is left gives the digital root 9. The Collatz sequence (halve if even, else 3n+1) takes 81 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70425 = 3^{2} \times 5^{2} \times 313 \]70425 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 18 |
| Sum of divisors | 126542 |
| Euler totient φ(n) | 37440 |
| Square | 4959680625 |
| Cube | 349285508015625 |
| Square root | 265.377090 (= 15√313) |
| Digit sum / digital root | 18 / 9 |
| Collatz steps to 1 | 81 |
| Scientific notation | 7.0425 × |
70425 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand four hundred and twenty-five |
| Binary (base 2) | 10001001100011001 |
| Octal (base 8) | 211431 |
| Hexadecimal (base 16) | 11319 |
| Base 3 | 10120121100 |
| As time | 70425 seconds = 19 h 33 min 45 s |
Is 70425 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | No (remainder 1) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | Yes (70425 ÷ 3 = 23475) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | No (remainder 1) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | Yes (70425 ÷ 5 = 14085) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 3) | 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 1) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | Yes (70425 ÷ 9 = 7825) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 5) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 3) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 9) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 70425 a prime number?
No. 70425 = × × 313, so it is divisible by 3.
What are the factors of 70425?
1, 3, 5, 9, 15, 25, 45, 75, 225, 313, 939, 1565, 2817, 4695, 7825, 14085, 23475, 70425.
What is 70425 in binary?
10001001100011001 (hexadecimal 11319, octal 211431).
What is the square root of 70425?
About 265.3771, exactly 15√313.
Is 70425 divisible by 3?
Yes. Its digits add up to 18, a multiple of 3.
What is special about the number 70425?
70425 is a happy number: repeatedly adding the squares of its digits reaches 1.