# 28

10

6

56

28 = 2 × 2 × 7

Factor Count
2 2
7 1

784

21952

## Square root of 28

5.29150262212918143234219314763322...

## Cube root of 28

3.03658897187566223507815266202670...

406

## Reciprocal of 28

0.0357142857142857

11100

5

## Octal of 28

34

1c

 Prime number No Hexagonal number Yes Perfect number No Deficient number No Abundant number No Mersenne number No Harshad number No Harmonic divisor number Yes

QR28 (sequence)

42

12

6

0

## Properties of 28

Properties of the number 28: 28 has 6 divisors. The divisors of 28 are 1, 2, 4, 7, 14, 28 and the sum of them is 56. The factorization of 28 is 2 × 2 × 7. The square and cube of 28 are 784 and 21952 respectively. The square root and cube root of 28 are 5.29150262212918143234219314763322... and 3.03658897187566223507815266202670.... The binary, octal, hexadecimal of 28 are 11100, 34, 1c. 28 is not a prime number, hexagonal number, not perfect number, not deficient number, not Mersenne number, not Mersenne number, not Harshad number, harmonic divisor number.

## sin 28

0.27090578830786904429572814478888...

## cos 28

-0.96260586631356659381708595901728...

## tan 28

-0.28142960456426524551432066800771...

## sin 28°

0.46947156278589080580232462125423...

## cos 28°

0.88294759285892698841280434862711...

## tan 28°

0.53170943166147877079197314742487...

## log 28

3.33220451017520380432301863038447...

## log10 28

1.44715803134221920878133005317068...

## log2 28

4.80735492205760372996792284538969...