Properties of the Number 28

Twenty-Eight

Basics

Value: 27 → 28 → 29

Parity: even

Prime: No

Previous Prime: 23

Next Prime: 29

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 7

Divisors: 1, 2, 4, 7, 14, 28

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11100

Octal: 34

Duodecimal: 24

Hexadecimal: 1c

Square: 784

Square Root: 5.291502622129181

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: Yes

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

No sequences found.