228221128 has 16 divisors (see below), whose sum is σ = 431703180. Its totient is φ = 113100288.

The previous prime is 228221093. The next prime is 228221137. The reversal of 228221128 is 821122822.

It can be written as a sum of positive squares in 2 ways, for example, as 198866404 + 29354724 = 14102^2 + 5418^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 228221096 and 228221105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125325 + ... + 127132.

Almost surely, 2^228221128 is an apocalyptic number.

It is an amenable number.

228221128 is a deficient number, since it is larger than the sum of its proper divisors (203482052).

228221128 is a wasteful number, since it uses less digits than its factorization.

228221128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252576 (or 252572 counting only the distinct ones).

The product of its digits is 2048, while the sum is 28.

The square root of 228221128 is about 15106.9893757823. The cubic root of 228221128 is about 611.1089100772.

The spelling of 228221128 in words is "two hundred twenty-eight million, two hundred twenty-one thousand, one hundred twenty-eight".