# 866

## 866 is an even composite number composed of two prime numbers multiplied together.

What does the number 866 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

866 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 866:

### 2 × 433

See below for interesting mathematical facts about the number 866 from the Numbermatics database.

### Names of 866

• Cardinal: 866 can be written as Eight hundred sixty-six.

### Scientific notation

• Scientific notation: 8.66 × 102

### Factors of 866

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 435

### Divisors of 866

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1302
• Sum of proper divisors (its aliquot sum) s(n): 436
• 866 is a deficient number, because the sum of its proper divisors (436) is less than itself. Its deficiency is 430

### Bases of 866

• Binary: 11011000102
• Base-36: O2

### Squares and roots of 866

• 866 squared (8662) is 749956
• 866 cubed (8663) is 649461896
• The square root of 866 is 29.4278779391
• The cube root of 866 is 9.5317497275

### Scales and comparisons

How big is 866?
• 866 seconds is equal to 14 minutes, 26 seconds.
• To count from 1 to 866 would take you about seven 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 866 cubic inches would be around 0.8 feet tall.

### Recreational maths with 866

• 866 backwards is 668
• The number of decimal digits it has is: 3
• The sum of 866's digits is 20
• More coming soon!