28549229 has 4 divisors (see below), whose sum is σ = 30051840. Its totient is φ = 27046620.

The previous prime is 28549217. The next prime is 28549259. The reversal of 28549229 is 92294582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28549229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28549259) 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 3 ways as a sum of consecutive naturals, for example, 751277 + ... + 751314.

It is an arithmetic number, because the mean of its divisors is an integer number (7512960).

Almost surely, 2^28549229 is an apocalyptic number.

It is an amenable number.

28549229 is a deficient number, since it is larger than the sum of its proper divisors (1502611).

28549229 is a wasteful number, since it uses less digits than its factorization.

28549229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502610.

The product of its digits is 103680, while the sum is 41.

The square root of 28549229 is about 5343.1478549634. The cubic root of 28549229 is about 305.6315106724.

The spelling of 28549229 in words is "twenty-eight million, five hundred forty-nine thousand, two hundred twenty-nine".