228090 has 16 divisors (see below), whose sum is σ = 547488. Its totient is φ = 60816.

The previous prime is 228077. The next prime is 228097. The reversal of 228090 is 90822.

228090 = 48² + 49² + ... + 92².

It is not an unprimeable number, because it can be changed into a prime (228097) by changing a digit.

228090 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3772 + ... + 3831.

It is an arithmetic number, because the mean of its divisors is an integer number (34218).

2²²⁸⁰⁹⁰ is an apocalyptic number.

228090 is an abundant number, since it is smaller than the sum of its proper divisors (319398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228090 is a wasteful number, since it uses less digits than its factorization.

228090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7613.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 228090 is about 477.5876882835. The cubic root of 228090 is about 61.0991846943.

The spelling of 228090 in words is "two hundred twenty-eight thousand, ninety".