The number 70525
70525 is a composite number with 24 divisors. Its prime factorisation is × 7 × 13 × 31. Divisors (24): 1, 5, 7, 13, 25, 31, 35, 65, 91, 155, 175, 217, 325, 403, 455, 775 … 70525.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
What is special about 70525: a happy number: repeatedly adding the squares of its digits reaches 1.
- 2
70525 is composite. Its prime factorisation is
- 3
The divisors add up to 111104; without 70525 itself that is 40579, so 70525 is deficient (40579 is less than 70525). Euler's totient φ(70525) = 43200 numbers up to 70525 share no factor with it.
- 4
The digits of 70525 add up to 19, and repeating that until one digit is left gives the digital root 1. The Collatz sequence (halve if even, else 3n+1) takes 55 steps to reach 1.
LaTeX source of the formulas on this page
\[ 70525 = 5^{2} \times 7 \times 13 \times 31 \]70525 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 24 |
| Sum of divisors | 111104 |
| Euler totient φ(n) | 43200 |
| Square | 4973775625 |
| Cube | 350775525953125 |
| Square root | 265.565434 (= 5√2821) |
| Digit sum / digital root | 19 / 1 |
| Collatz steps to 1 | 55 |
| Scientific notation | 7.0525 × |
70525 in other forms
| Form | Value |
|---|---|
| In words | seventy thousand five hundred and twenty-five |
| Binary (base 2) | 10001001101111101 |
| Octal (base 8) | 211575 |
| Hexadecimal (base 16) | 1137D |
| Base 3 | 10120202001 |
| As time | 70525 seconds = 19 h 35 min 25 s |
Is 70525 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 | No (remainder 1) | 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 (70525 ÷ 5 = 14105) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 1) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | Yes (70525 ÷ 7 = 10075) | 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 5) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 1) | 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 4) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 1) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 70525 a prime number?
No. 70525 = × 7 × 13 × 31, so it is divisible by 5.
What are the factors of 70525?
1, 5, 7, 13, 25, 31, 35, 65, 91, 155, 175, 217, 325, 403, 455, 775, 1085, 2015, 2275, 2821, 5425, 10075, 14105, 70525.
What is 70525 in binary?
10001001101111101 (hexadecimal 1137D, octal 211575).
What is the square root of 70525?
About 265.5654, exactly 5√2821.
Is 70525 divisible by 3?
No. Its digits add up to 19, which is not a multiple of 3.
What is special about the number 70525?
70525 is a happy number: repeatedly adding the squares of its digits reaches 1.