Properties of the Number 28868

Twenty-Eight Thousand Eight Hundred Sixty-Eight

Basics

Value: 28867 → 28868 → 28869

Parity: even

Prime: No

Previous Prime: 28867

Next Prime: 28871

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 7 × 1031

Divisors: 1, 2, 4, 7, 14, 28, 1031, 2062, 4124, 7217

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000011000100

Octal: 70304

Duodecimal: 14858

Hexadecimal: 70c4

Square: 833361424

Square Root: 169.90585628517928

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

∑_0<j<k<=n P(k)-P(j), where P(j)=A065091(j) is the j-th odd prime. A206803

Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A259003

Number of ordered 5-tuples of integers from [ 1,n ] with no common factors among pairs. A15663

Sum of binomial numbers A000332(k+3), with k in the reduced residue system modulo n. A192000

Least nonnegative integer which requires n letters to spell in Turkish excluding spaces and hyphens. A305100

Primes that when squared give numbers with digits in nonascending order. A28868

Numerator of squared radius of inscribed circle of the n-th triangle with integer sides in the list given by A316841. Denominators are A331258. A331257

Number of n X 4 0..4 arrays with each element·equal to the number its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4. A196134