There are six common sets of numbers.

Natural (Counting) Numbers: <math><mstyle displaystyle="true"><mrow><mo>{</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>,</mo><mn>4</mn><mo>,</mo><mn>5</mn><mo>,</mo><mo>…</mo><mo>}</mo></mrow></mstyle></math>

Whole Numbers: Natural Numbers and <math><mstyle displaystyle="true"><mrow><mo>{</mo><mn>0</mn><mo>}</mo></mrow></mstyle></math>

Integers: <math><mstyle displaystyle="true"><mrow><mo>{</mo><mo>…</mo><mo>,</mo><mo>-</mo><mn>3</mn><mo>,</mo><mo>-</mo><mn>2</mn><mo>,</mo><mo>-</mo><mn>1</mn><mo>,</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>,</mo><mo>…</mo><mo>}</mo></mrow></mstyle></math>

Rational Numbers: Integers, Fractions, and Terminating or Repeating Decimals

Irrational Numbers: Non Terminating or Non Repeating Decimals

Real Numbers: Rational Numbers and Irrational Numbers

Because the number is imaginary, it is not included in one of the six common sets of numbers.

No Set

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Name | seven hundred twenty-six million two hundred eighty-one thousand seven hundred sixteen |
---|

- 726281716 has 8 divisors, whose sum is
**1634133870** - The reverse of 726281716 is
**617182627** - Previous prime number is
**2**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 40
- Digital Root 4

Name | four hundred thirty-two million nine hundred sixty-one thousand four hundred seven |
---|

- 432961407 has 32 divisors, whose sum is
**523776000** - The reverse of 432961407 is
**704169234** - Previous prime number is
**31**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 36
- Digital Root 9

Name | one billion eight hundred ninety-one million four hundred five thousand nine hundred twenty-seven |
---|

- 1891405927 has 4 divisors, whose sum is
**1891794280** - The reverse of 1891405927 is
**7295041981** - Previous prime number is
**4933**

- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 46
- Digital Root 1