228506185 has 8 divisors (see below), whose sum is σ = 275793480. Its totient is φ = 181747584.

The previous prime is 228506143. The next prime is 228506189. The reversal of 228506185 is 581605822.

It can be written as a sum of positive squares in 4 ways, for example, as 132779529 + 95726656 = 11523^2 + 9784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228506185 - 2¹⁷ = 228375113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228506189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131220 + ... + 132949.

It is an arithmetic number, because the mean of its divisors is an integer number (34474185).

Almost surely, 2^228506185 is an apocalyptic number.

It is an amenable number.

228506185 is a deficient number, since it is larger than the sum of its proper divisors (47287295).

228506185 is a wasteful number, since it uses less digits than its factorization.

228506185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264347.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 228506185 is about 15116.4210380632. The cubic root of 228506185 is about 611.3632370925.

The spelling of 228506185 in words is "two hundred twenty-eight million, five hundred six thousand, one hundred eighty-five".