# 70

## 70 is an even composite number composed of three prime numbers multiplied together.

What does the number 70 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

70 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 70:

### 2 × 5 × 7

See below for interesting mathematical facts about the number 70 from the Numbermatics database.

### Names of 70

• Cardinal: 70 can be written as Seventy.

### Scientific notation

• Scientific notation: 7 × 101

### Factors of 70

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 14

### Divisors of 70

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 144
• Sum of proper divisors (its aliquot sum) s(n): 74
• 70 is an abundant number, because the sum of its proper divisors (74) is greater than itself. Its abundance is 4

### Bases of 70

• Binary: 10001102
• Base-36: 1Y

### Squares and roots of 70

• 70 squared (702) is 4900
• 70 cubed (703) is 343000
• The square root of 70 is 8.3666002653
• The cube root of 70 is 4.1212852999

### Scales and comparisons

How big is 70?
• 70 seconds is equal to 10 seconds.
• To count from 1 to 70 would take you about thirty-five seconds.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 70 cubic inches would be around 0.3 feet tall.

### Recreational maths with 70

• 70 backwards is 07
• 70 is a Harshad number.
• The number of decimal digits it has is: 2
• The sum of 70's digits is 7
• More coming soon!