Enter any number (whole or decimal) to see place value, prime factors, divisors and more. No sign-in. More walkthroughs: GCSE maths revision & step-by-step help
This free maths tool shows number facts including: place value, prime factorisation, divisors, sum of digits and digital root; Roman numerals; binary, octal and hexadecimal; sum of two squares and sum of four squares (Lagrange’s theorem); polite numbers (sum of consecutive integers); perfect square, perfect cube, triangular number, pentagonal number, hexagonal number; Fibonacci number, factorial; twin prime, cousin prime, Sophie Germain prime, safe prime; Harshad number, happy number, Kaprekar number; and visualisations (factor tree, number line, prime factor pie).