228128085 has 12 divisors (see below), whose sum is σ = 395422092. Its totient is φ = 121668288.

The previous prime is 228128081. The next prime is 228128111. The reversal of 228128085 is 580821822.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39917124 + 188210961 = 6318^2 + 13719^2 .

It is not a de Polignac number, because 228128085 - 2² = 228128081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228128081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2534712 + ... + 2534801.

It is an arithmetic number, because the mean of its divisors is an integer number (32951841).

Almost surely, 2^228128085 is an apocalyptic number.

It is an amenable number.

228128085 is a deficient number, since it is larger than the sum of its proper divisors (167294007).

228128085 is a wasteful number, since it uses less digits than its factorization.

228128085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5069524 (or 5069521 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 228128085 is about 15103.9095932146. The cubic root of 228128085 is about 611.0258515460.

The spelling of 228128085 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, eighty-five".