28355229 has 12 divisors (see below), whose sum is σ = 46808736. Its totient is φ = 16202952.

The previous prime is 28355227. The next prime is 28355237. The reversal of 28355229 is 92255382.

28355229 is a `hidden beast` number, since 2 + 83 + 552 + 29 = 666.

It is not a de Polignac number, because 28355229 - 2¹ = 28355227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28355193 and 28355202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28355221) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 224979 + ... + 225104.

It is an arithmetic number, because the mean of its divisors is an integer number (3900728).

Almost surely, 2^28355229 is an apocalyptic number.

It is an amenable number.

28355229 is a deficient number, since it is larger than the sum of its proper divisors (18453507).

28355229 is a wasteful number, since it uses less digits than its factorization.

28355229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450096 (or 450093 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 28355229 is about 5324.9628167716. The cubic root of 28355229 is about 304.9376527581.

The spelling of 28355229 in words is "twenty-eight million, three hundred fifty-five thousand, two hundred twenty-nine".