228665861 has 8 divisors (see below), whose sum is σ = 243125784. Its totient is φ = 214318080.

The previous prime is 228665851. The next prime is 228665867. The reversal of 228665861 is 168566822.

It can be written as a sum of positive squares in 4 ways, for example, as 101404900 + 127260961 = 10070^2 + 11281^2 .

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 228665861 - 2¹⁰ = 228664837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228665867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23810 + ... + 32003.

It is an arithmetic number, because the mean of its divisors is an integer number (30390723).

Almost surely, 2^228665861 is an apocalyptic number.

It is an amenable number.

228665861 is a deficient number, since it is larger than the sum of its proper divisors (14459923).

228665861 is a wasteful number, since it uses less digits than its factorization.

228665861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56071.

The product of its digits is 276480, while the sum is 44.

The square root of 228665861 is about 15121.7016568903. The cubic root of 228665861 is about 611.5056071363.

The spelling of 228665861 in words is "two hundred twenty-eight million, six hundred sixty-five thousand, eight hundred sixty-one".