Properties of the Number 28778

Twenty-Eight Thousand Seven Hundred Seventy-Eight

Basics

Value: 28777 → 28778 → 28779

Parity: even

Prime: No

Previous Prime: 28771

Next Prime: 28789

Digit Sum: 32

Digital Root: 5

Palindrome: No

Factorization: 2 × 14389

Divisors: 1, 2, 14389, 28778

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 111000001101010

Octal: 70152

Duodecimal: 147A2

Hexadecimal: 706a

Square: 828173284

Square Root: 169.64079697997178

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 distinct solutions of sum{i=1..k}(x(2i-1)*x(2i)) = 1 (mod n), with x() in 0..n-1. A180813

Least positive k such that k * [RSA-640]ⁿ - 1 is prime, where RSA-640 is the 193 decimal digit RSA challenge number A391940(14). A108573

Number of distinct solutions of sum{i=1..5}(x(2i-1)*x(2i)) = 1 (mod n), with x() in 0..n-1. A180807

Number of nX5 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing. A223767

T(n,k)=Number of nXk 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing. A223770

Nonsquares mod 65. A28778