28 Number Properties & Facts

Primality

Prime Factorization of 28

2² × 7¹

Number of Divisors of 28

6

1, 2, 4, 7, 14, 28

1, 2, 4, 7, 14, 28

Is 28 Prime?

No

Trigonometry

Sine of 28

0.27090578830787

Cosecant: 3.6913201679676

Cosine of 28

-0.96260586631357

Secant: -1.0388467751912

Tangent of 28

-0.28142960456427

Cotangent: -3.5532864481272

Functions

Square of 28

784

28 × 28 = 784

Square Root of 28

5.2915026221292

5.2915026221292² = 28

Natural Logarithm (ln) of 28

3.3322045101752

e^{3.3322045101752} = 28

Decimal Logarithm (log) of 28

1.4471580313422

10^{1.4471580313422} = 28

Sequences

Is 28 a Fibonacci Number?

No

Is 28 a Bell Number?

No

Is 28 a Catalan Number?

No

Is 28 a Factorial?

No

Is 28 a Perfect Number?

Yes: #2

Translations

Numeric Bases

28 in Binary (Base 2)

0b11100

One's Complement: 00011

Two's Complement: 00100

28 in Octal (Base 8)

034

28 in Hexadecimal (Base 16)

0x1C

Miscellaneous

• 28 is an even number
• 28 has 2 Significant Figures
• The Hamming Weight of 28 is 3
• 28 is not a Hamming (Regular) Number
• 28 is a Humble Number
• 28 is a Polygonal (s < 13) Number: Triangular (7), Hexagonal (4)
• 28 is a Happy Number
• 28 is not a Self Describing Number
• 28 is not a Palindrome
• 28 is not a Münchhausen Number
• 28 is not an Eban Number
• 28 is a Pernicious Number
• 28 is an Attractive Number
• 28 is not a Perfect Square
• 28 is not a Perfect Power