Properties of the Number 28240

Twenty-Eight Thousand Two Hundred Forty

Basics

Value: 28239 → 28240 → 28241

Parity: even

Prime: No

Previous Prime: 28229

Next Prime: 28277

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ⁴ × 5 × 353

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 110111001010000

Octal: 67120

Duodecimal: 14414

Hexadecimal: 6e50

Square: 797497600

Square Root: 168.04761230080004

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

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

T(n,k)=Number of length n+4 0..k arrays with no five consecutive terms having two times the sum of any three elements equal to three times the sum of the remaining two. A249001

a(n) = 441n² + 2n. A158321

A convolution triangle of numbers generalizing Pascal's triangle A007318. A49325

a(n) is the number of n-tosses having a run of 6 or more heads for a fair coin (i.e., probability is a(n)/2ⁿ). A143662

a(n) = 64·n² + 16. A157912

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 21. A31699

Number of length n+4 0..3 arrays with no five consecutive terms having two times the sum of any three elements equal to three times the sum of the remaining two. A248996

Number of length 4+4 0..n arrays with no five consecutive terms having two times the sum of any three elements equal to three times the sum of the remaining two. A249005

Numbers k such that Bernoulli number B_k has denominator 230010. A295593

a(n) = ∑_{i=0..floor(n/2)} T(2i,n-2i), array T as in A049723. A49726