# 278

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

What does the number 278 look like?

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

278 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 278:

### 2 × 139

See below for interesting mathematical facts about the number 278 from the Numbermatics database.

### Names of 278

• Cardinal: 278 can be written as Two hundred seventy-eight.

### Scientific notation

• Scientific notation: 2.78 × 102

### Factors of 278

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 141

### Divisors of 278

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 420
• Sum of proper divisors (its aliquot sum) s(n): 142
• 278 is a deficient number, because the sum of its proper divisors (142) is less than itself. Its deficiency is 136

### Bases of 278

• Binary: 1000101102
• Base-36: 7Q

### Squares and roots of 278

• 278 squared (2782) is 77284
• 278 cubed (2783) is 21484952
• The square root of 278 is 16.6733320005
• The cube root of 278 is 6.5265188793

### Scales and comparisons

How big is 278?
• 278 seconds is equal to 4 minutes, 38 seconds.
• To count from 1 to 278 would take you about two 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 278 cubic inches would be around 0.5 feet tall.

### Recreational maths with 278

• 278 backwards is 872
• The number of decimal digits it has is: 3
• The sum of 278's digits is 17
• More coming soon!