Properties of the Number 64780

Sixty-Four Thousand Seven Hundred Eighty

Basics

Value: 64779 → 64780 → 64781

Parity: even

Prime: No

Previous Prime: 64763

Next Prime: 64781

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 41 × 79

Divisors: 1, 2, 4, 5, 10, 20, 41, 79, 82, 158

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 1111110100001100

Octal: 176414

Duodecimal: 315A4

Hexadecimal: fd0c

Square: 4196448400

Square Root: 254.51915448547285

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

Octagonal pyramidal numbers: a(n) = n*(n+1)*(2·n-1)/2. A2414

Number of partitions of n with more even parts than odd parts. A108949

Number of reduced words of length n in Coxeter group on 41 generators S_i with relations (S_i)² = (S_i S_j)³ = I. A162878

a(n) = floor(Fibonacci(n)^1/π). A171962

Even octagonal pyramidal numbers (A002414). A218327

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 597", based on the 5-celled von Neumann neighborhood. A273146

a(n) = Sum{T(n,k)}, k = 0,1,...,n, where T is the array in A026148. A26164

Number of times n occurs in A000195. A64780

Number of n X 4 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. A298129