Properties of the Number 28823

Twenty-Eight Thousand Eight Hundred Twenty-Three

Basics

Value: 28822 → 28823 → 28824

Parity: odd

Prime: No

Previous Prime: 28817

Next Prime: 28837

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 19 × 37 × 41

Divisors: 1, 19, 37, 41, 703, 779, 1517, 28823

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000010010111

Octal: 70227

Duodecimal: 1481B

Hexadecimal: 7097

Square: 830765329

Square Root: 169.7733783606841

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) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise. A235660

a(n) = (n+1)*(n-2)*(n-3)/2. A212343

Numerator of ∑_k=1..n k⁴ / ∏_k=1..n k⁴. A181426

41 times triangular numbers. A195038

Number of (n+1)X(2+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise. A235654

Number of (n+1)X(5+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise. A235657

Numbers k such that φ(k) = φ(2·k-1) where φ is the Euler totient function (A000010). A333407

Numbers k such that k² + k + 17 is prime. A28823

a(n) is the number of ordered solutions (x,y,z) to x² + y² == z² mod n with 1 <= x,y,z <= n-1. A136679