228643081 has 8 divisors (see below), whose sum is σ = 245410344. Its totient is φ = 212244480.

The previous prime is 228643049. The next prime is 228643097. The reversal of 228643081 is 180346822.

It can be written as a sum of positive squares in 4 ways, for example, as 77721856 + 150921225 = 8816^2 + 12285^2 .

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 228643081 - 2⁵ = 228643049 is a prime.

It is a super-2 number, since 2×228643081² = 104555316978345122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228643021) 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, 90880 + ... + 93361.

It is an arithmetic number, because the mean of its divisors is an integer number (30676293).

Almost surely, 2^228643081 is an apocalyptic number.

It is an amenable number.

228643081 is a deficient number, since it is larger than the sum of its proper divisors (16767263).

228643081 is a wasteful number, since it uses less digits than its factorization.

228643081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184331.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 228643081 is about 15120.9484160221. The cubic root of 228643081 is about 611.4853001255.

The spelling of 228643081 in words is "two hundred twenty-eight million, six hundred forty-three thousand, eighty-one".