Nearby Numbers

Positive, nonzero integers within three units

25

Twenty-Five

26

Twenty-Six

27

Twenty-Seven

29

Twenty-Nine

30

Thirty

31

Thirty-One

Scientific Notation

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

2.8e1

Reciprocal

A number multiplied with its reciprocal is one.

0.03571428571428571

The reciprocal of 28.

Palindrome?

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

The number 28 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 10 Decimal

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

2

Two

7

Seven

Prime Factorization

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

22 · 71 = 28

Base Conversions

The number twenty-eight in 35 different bases