228031840 has 24 divisors (see below), whose sum is σ = 538725600. Its totient is φ = 91212672.

The previous prime is 228031823. The next prime is 228031849. The reversal of 228031840 is 48130822.

228031840 = 1856² + 1857² + ... + 1919².

It is a junction number, because it is equal to n+sod(n) for n = 228031799 and 228031808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228031849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712440 + ... + 712759.

It is an arithmetic number, because the mean of its divisors is an integer number (22446900).

Almost surely, 2^228031840 is an apocalyptic number.

228031840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228031840 is an abundant number, since it is smaller than the sum of its proper divisors (310693760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228031840 is a wasteful number, since it uses less digits than its factorization.

228031840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425214 (or 1425206 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 228031840 is about 15100.7231614913. The cubic root of 228031840 is about 610.9399108558.

The spelling of 228031840 in words is "two hundred twenty-eight million, thirty-one thousand, eight hundred forty".