# 805

## 805 is an odd composite number composed of three prime numbers multiplied together.

What does the number 805 look like?

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

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

## Prime factorization of 805:

### 5 × 7 × 23

See below for interesting mathematical facts about the number 805 from the Numbermatics database.

### Names of 805

• Cardinal: 805 can be written as Eight hundred five.

### Scientific notation

• Scientific notation: 8.05 × 102

### Factors of 805

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 35

### Divisors of 805

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 1152
• Sum of proper divisors (its aliquot sum) s(n): 347
• 805 is a deficient number, because the sum of its proper divisors (347) is less than itself. Its deficiency is 458

### Bases of 805

• Binary: 11001001012
• Base-36: MD

### Squares and roots of 805

• 805 squared (8052) is 648025
• 805 cubed (8053) is 521660125
• The square root of 805 is 28.3725219183
• The cube root of 805 is 9.3024774685

### Scales and comparisons

How big is 805?
• 805 seconds is equal to 13 minutes, 25 seconds.
• To count from 1 to 805 would take you about six minutes.

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 805 cubic inches would be around 0.8 feet tall.

### Recreational maths with 805

• 805 backwards is 508
• The number of decimal digits it has is: 3
• The sum of 805's digits is 13
• More coming soon!