Properties of the Number 78428

Seventy-Eight Thousand Four Hundred Twenty-Eight

Basics

Value: 78427 → 78428 → 78429

Parity: even

Prime: No

Previous Prime: 78427

Next Prime: 78437

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 7 × 2801

Divisors: 1, 2, 4, 7, 14, 28, 2801, 5602, 11204, 19607

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10011001001011100

Octal: 231134

Duodecimal: 39478

Hexadecimal: 1325c

Square: 6150951184

Square Root: 280.0499955365113

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

a(1) = 1, a(n) = ∑_k=1..n-1 ∑_d∣k a(d). A14668

a(n) = concatenation of n² and n. A55436

a(n) = 100·n² + n. A55438

Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20. A31698

a(n) = 400·n² + 2·n. A158312

a(n) = 784·n² + 28. A158659

First index in A362061 where A001221(A362061(a(n))) = n. A362062

a(n) is the least·such that the cyclotomic polynomial values φ(d,x) are prime for all d dividing n. A72942

Partial sums of A035187. A78428