Properties of the Number 78409

Seventy-Eight Thousand Four Hundred Nine

Basics

Value: 78408 → 78409 → 78410

Parity: odd

Prime: No

Previous Prime: 78401

Next Prime: 78427

Digit Sum: 28

Digital Root: 1

Palindrome: No

Factorization: 89 × 881

Divisors: 1, 89, 881, 78409

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011001001001001

Octal: 231111

Duodecimal: 39461

Hexadecimal: 13249

Square: 6147971281

Square Root: 280.0160709673643

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

Composite and every divisor (except 1) contains the digit 8. A62678

Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers. A69106

Start with a square; at each stage add a square at each expandable vertex so that the ratio of the side of the squares at stage n+1 and at stage n is the golden ratio φ=0.618...; a(n) is the number of squares at n-th stage. A269962

Numbers k such that the sum of the first k odd composites is palindromic. A58848

a(n) is the smallest composite squarefree number k such that (p+n) | (k-1) for every prime p dividing k. A274445

Least nonsquare whose remainder modulo k² is a square for all 0 < k <= n. A81650

Numbers k that divide Fibonacci(k-1) but do not divide Fibonacci(k) - 1. A94410

a(n) = 72·n² + 1. A158740

Semiprimes k that divide Fibonacci(k-1). A177086

Strong pseudoprimes to base 76. A20302