228128849 has 4 divisors (see below), whose sum is σ = 245677236. Its totient is φ = 210580464.

The previous prime is 228128843. The next prime is 228128851. The reversal of 228128849 is 948821822.

It is a happy number.

228128849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67650625 + 160478224 = 8225^2 + 12668^2 .

It is a cyclic number.

It is not a de Polignac number, because 228128849 - 2⁴ = 228128833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228128843) 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, 8774174 + ... + 8774199.

It is an arithmetic number, because the mean of its divisors is an integer number (61419309).

Almost surely, 2^228128849 is an apocalyptic number.

It is an amenable number.

228128849 is a deficient number, since it is larger than the sum of its proper divisors (17548387).

228128849 is a wasteful number, since it uses less digits than its factorization.

228128849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17548386.

The product of its digits is 147456, while the sum is 44.

The square root of 228128849 is about 15103.9348846584. The cubic root of 228128849 is about 611.0265336529.

The spelling of 228128849 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, eight hundred forty-nine".