Properties of the Number 28678

Twenty-Eight Thousand Six Hundred Seventy-Eight

Basics

Value: 28677 → 28678 → 28679

Parity: even

Prime: No

Previous Prime: 28669

Next Prime: 28687

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 × 13 × 1103

Divisors: 1, 2, 13, 26, 1103, 2206, 14339, 28678

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111000000000110

Octal: 70006

Duodecimal: 1471A

Hexadecimal: 7006

Square: 822427684

Square Root: 169.34580006601877

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

Numbers n such that σ(n) is a Fibonacci number. A272412

Exponents m such that the decimal expansion of 4^m exhibits its first zero from the right later than any previous exponent. A239009

a(n) = 3·a(n-1) - 2·a(n-2) - a(n-3) + a(n-4), where a(1) = 1, a(2) = 3, a(3) = 5, a(4) = 8. A232896

Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a²+b²+c²+d²+e²+f²+g² = 2abcdefg. A227210

Number of edges in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n. A392444

y-values in the solution to x² - 13y² = 108. A228206

Closed 3-dimensional ball numbers (version 2): a(n)= number of integer points (i,j,k) contained in a closed ball of diameter n, centered at (1/2,0,0). A53593

Areas of a sequence of right-angled figures described below. A58195

Numbers k such that k and k² use only the digits 2, 4, 6, 7 and 8. A137101

a(n) is the smallest nonnegative integer m such that the integer part of tan(m) is equal to n. A327788