Properties of the Number 79820

Seventy-Nine Thousand Eight Hundred Twenty

Basics

Value: 79819 → 79820 → 79821

Parity: even

Prime: No

Previous Prime: 79817

Next Prime: 79823

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ² × 5 × 13 × 307

Divisors: 1, 2, 4, 5, 10, 13, 20, 26, 52, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011011111001100

Octal: 233714

Duodecimal: 3A238

Hexadecimal: 137cc

Square: 6371232400

Square Root: 282.52433523503777

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

10-gonal (or decagonal) pyramidal numbers: a(n) = n*(n + 1)*(8·n - 5)/6. A7585

T(n,k)=Agreement numbers: number of nXk arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 nXk array. A220786

a(n) = n*(n³ - n + 2)/2. A101374

T(n,k)=Agreement numbers: number of nXk arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..2 nXk array. A220800

Agreement numbers: number of n X 2 arrays of the count of horizontal and vertical neighbors equal to the corresponding element in a random 0..3 n X 2 array. A220783

Expansion of ∑_k>0 (1/(1-x^k)⁵ - 1). A363695

Even, nonzero decagonal pyramidal numbers. A218331

Number of positions that are exactly n moves from the starting position in the Rubik's UFO puzzle. A79820