228489185 has 4 divisors (see below), whose sum is σ = 274187028. Its totient is φ = 182791344.

The previous prime is 228489181. The next prime is 228489203. The reversal of 228489185 is 581984822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581984822 = 2 ⋅290992411.

It can be written as a sum of positive squares in 2 ways, for example, as 66716224 + 161772961 = 8168^2 + 12719^2 .

It is a cyclic number.

It is not a de Polignac number, because 228489185 - 2² = 228489181 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228489181) 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, 22848914 + ... + 22848923.

It is an arithmetic number, because the mean of its divisors is an integer number (68546757).

Almost surely, 2^228489185 is an apocalyptic number.

It is an amenable number.

228489185 is a deficient number, since it is larger than the sum of its proper divisors (45697843).

228489185 is an equidigital number, since it uses as much as digits as its factorization.

228489185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45697842.

The product of its digits is 368640, while the sum is 47.

The square root of 228489185 is about 15115.8587251932. The cubic root of 228489185 is about 611.3480756754.

The spelling of 228489185 in words is "two hundred twenty-eight million, four hundred eighty-nine thousand, one hundred eighty-five".