228290 has 16 divisors (see below), whose sum is σ = 422712. Its totient is φ = 88704.

The previous prime is 228281. The next prime is 228299. The reversal of 228290 is 92822.

It is an interprime number because it is at equal distance from previous prime (228281) and next prime (228299).

It can be written as a sum of positive squares in 4 ways, for example, as 167281 + 61009 = 409^2 + 247^2 .

It is a super-4 number, since 4×228290⁴ (a number of 23 digits) contains 4444 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228299) 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, 62 + ... + 678.

2²²⁸²⁹⁰ is an apocalyptic number.

228290 is a deficient number, since it is larger than the sum of its proper divisors (194422).

228290 is a wasteful number, since it uses less digits than its factorization.

228290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 228290 is about 477.7970280360. The cubic root of 228290 is about 61.1170376866.

The spelling of 228290 in words is "two hundred twenty-eight thousand, two hundred ninety".