# 649

## 649 is an odd composite number composed of two prime numbers multiplied together.

What does the number 649 look like?

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

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

## Prime factorization of 649:

### 11 × 59

See below for interesting mathematical facts about the number 649 from the Numbermatics database.

### Names of 649

• Cardinal: 649 can be written as Six hundred forty-nine.

### Scientific notation

• Scientific notation: 6.49 × 102

### Factors of 649

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 70

### Divisors of 649

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 720
• Sum of proper divisors (its aliquot sum) s(n): 71
• 649 is a deficient number, because the sum of its proper divisors (71) is less than itself. Its deficiency is 578

### Bases of 649

• Binary: 10100010012
• Base-36: I1

### Squares and roots of 649

• 649 squared (6492) is 421201
• 649 cubed (6493) is 273359449
• The square root of 649 is 25.4754784057
• The cube root of 649 is 8.6579465215

### Scales and comparisons

How big is 649?
• 649 seconds is equal to 10 minutes, 49 seconds.
• To count from 1 to 649 would take you about five 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 649 cubic inches would be around 0.7 feet tall.

### Recreational maths with 649

• 649 backwards is 946
• The number of decimal digits it has is: 3
• The sum of 649's digits is 19
• More coming soon!