Properties of the Number 28489

Twenty-Eight Thousand Four Hundred Eighty-Nine

Basics

Value: 28488 → 28489 → 28490

Parity: odd

Prime: No

Previous Prime: 28477

Next Prime: 28493

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 31 × 919

Divisors: 1, 31, 919, 28489

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111101001001

Octal: 67511

Duodecimal: 145A1

Hexadecimal: 6f49

Square: 811623121

Square Root: 168.78684782885188

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 (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,1 1,0 2,1 or -1,-1. A264476

Minimal peaks in digital expansions of π: positions of peaks equal to 1. A105275

Number of partitions of 1, 2, 3, or more copies of n into distinct parts. A258289

Number of (n+1)X(6+1) arrays of permutations of 0..n·7+6 with each element having directed index change 0,1 1,0 2,1 or -1,-1. A264474

Number of (5+1)X(n+1) arrays of permutations of 0..n·6+5 with each element having directed index change 0,1 1,0 2,1 or -1,-1. A264479

a(n) = floor(1/(1-s(n))) where s(n) = ∑_k=1..n φ(k)/k·log(2^k/(2^k-1)). φ(k) is the Euler totient function A000010(k). A383024

Duplicate of A005808. A28489