Properties of the Number 28107

Twenty-Eight Thousand One Hundred Seven

Basics

Value: 28106 → 28107 → 28108

Parity: odd

Prime: No

Previous Prime: 28099

Next Prime: 28109

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 347

Divisors: 1, 3, 9, 27, 81, 347, 1041, 3123, 9369, 28107

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110110111001011

Octal: 66713

Duodecimal: 14323

Hexadecimal: 6dcb

Square: 790003449

Square Root: 167.65142409177443

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..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A253749

Concatenate n with n-th prime. A45532

a(n) = ∑_{1 <= i, j <= n} gcd(i, j, n)³. A368743

a(n) = A007318 * [1, 6, 14, 9, 0, 0, 0, ...]. A143690

Numbers a = b + c where a, b, and c contain the same decimal digits. A203024

Number of (n+1) X (1+1) 0..2 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A253742

Number of (n+1)X(5+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A253746

Number of (5+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A253753

Distinct-digit numbers that are the concatenation of m and prime(m) for some number m. A255729

Number of permutations of [n] avoiding {4231, 3412, 1234}. A294725