Properties of the Number 77980

Seventy-Seven Thousand Nine Hundred Eighty

Basics

Value: 77979 → 77980 → 77981

Parity: even

Prime: No

Previous Prime: 77977

Next Prime: 77983

Digit Sum: 31

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 7 × 557

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011000010011100

Octal: 230234

Duodecimal: 39164

Hexadecimal: 1309c

Square: 6080880400

Square Root: 279.2489928361426

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

Structured truncated tetrahedral numbers. A100156

T(n,k) is the number of size k ordered submultisets of the regular multiset {1_1,1_2,...,1_n-1,1_n, ... ,i₁,i₂,...,i_n-1,i_n, ... ,n₁,n₂,...,n_n-1,n_n} (which contains n copies of i for 1 <= i <= n). A234574

Expansion of a q-series used by Ramanujan in his Lost Notebook. A279715

Decagonal numbers divisible by 10. A117797

Numerator of Hermite(n, 7/31). A160305

Numbers k such that k² + 1 = p·q, p < q primes and q-p is a power of 2. A238947

Expansion of 1/(1 + x + 2·x² + 2·x³). A77980