← back to the spiralPrime factorisation
2 128
compositeA composite number is greater than 1 and has divisors beyond 1 and itself, so it splits into a product of smaller primes.
Learn more →Prime factorisationEvery whole number above 1 splits into a product of primes in exactly one way — its prime factorisation.
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Every whole number above 1 splits into a product of primes in exactly one way — its prime factorisation.
Learn more →2 128 = 2⁴ × 7 × 19
2222719
parity
even
digits
4
digit sum
The digit sum just adds up the digits — handy for divisibility tricks (a number is divisible by 3 exactly when its digit sum is).
13
divisors τ
τ (tau) counts how many positive divisors a number has, including 1 and itself.
Learn more →20
sum of divisors σ
σ (sigma) is the sum of all positive divisors of a number, including 1 and itself.
Learn more →4 960
classification
Compare a number to the sum of its proper divisors: equal means perfect, more means abundant, less means deficient.
Learn more →abundant