# 1a18

The numbers with a 18 subscript use Base 18 Octodecimal notation.

For more familiar numbers: See Twenty-Eight in Base 10 Decimal

## Nearby Numbers

Positive, nonzero integers within three units

25
1718
Twenty-Five in Base 18 Octodecimal
26
1818
Twenty-Six in Base 18 Octodecimal
27
1918
Twenty-Seven in Base 18 Octodecimal
29
1b18
Twenty-Nine in Base 18 Octodecimal
30
1c18
Thirty in Base 18 Octodecimal
31
1d18
Thirty-One in Base 18 Octodecimal

## Scientific Notation

Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.

## Reciprocal

A number multiplied with its reciprocal is one.

### `0.0ba52a52a52a518`

The reciprocal of 28 in Base 18 Octodecimal.

## Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 1a18 is not a palindrome.

## Not A Prime Number

A prime number is a positive integer that is divisible only by itself and one.

Twenty-eight is a composite number with 6 total factors (including 1 and itself).   See primes in Base 18 Octodecimal

## A Composite

Composites have more than just these two factors.

Twenty-eight is a composite number with 6 total factors (including 1 and itself).

## Prime Factors

The prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number twenty-eight has the following 2 prime factors:

2
218
Two in Base 18 Octodecimal
7
718
Seven in Base 18 Octodecimal

## Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

## Base Conversions

The number twenty-eight in 35 different bases