28690229 has 2 divisors, whose sum is σ = 28690230. Its totient is φ = 28690228.

The previous prime is 28690199. The next prime is 28690273. The reversal of 28690229 is 92209682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23261329 + 5428900 = 4823^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 28690229 - 2¹⁶ = 28624693 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28690192 and 28690201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28690279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345114 + 14345115.

It is an arithmetic number, because the mean of its divisors is an integer number (14345115).

Almost surely, 2^28690229 is an apocalyptic number.

It is an amenable number.

28690229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28690229 is an equidigital number, since it uses as much as digits as its factorization.

28690229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 28690229 is about 5356.3260729720. The cubic root of 28690229 is about 306.1338393833.

The spelling of 28690229 in words is "twenty-eight million, six hundred ninety thousand, two hundred twenty-nine".