28022229 has 12 divisors (see below), whose sum is σ = 41464332. Its totient is φ = 18225600.

The previous prime is 28022221. The next prime is 28022231. The reversal of 28022229 is 92222082.

It can be written as a sum of positive squares in 2 ways, for example, as 12006225 + 16016004 = 3465^2 + 4002^2 .

It is not a de Polignac number, because 28022229 - 2³ = 28022221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28022221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37602 + ... + 38339.

It is an arithmetic number, because the mean of its divisors is an integer number (3455361).

Almost surely, 2^28022229 is an apocalyptic number.

It is an amenable number.

28022229 is a deficient number, since it is larger than the sum of its proper divisors (13442103).

28022229 is a wasteful number, since it uses less digits than its factorization.

28022229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75988 (or 75985 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28022229 is about 5293.6026484805. The cubic root of 28022229 is about 303.7392334750.

The spelling of 28022229 in words is "twenty-eight million, twenty-two thousand, two hundred twenty-nine".