28328049 has 10 divisors (see below), whose sum is σ = 42317330. Its totient is φ = 18885312.

The previous prime is 28327979. The next prime is 28328063. The reversal of 28328049 is 94082382.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 5143824 = 4815^2 + 2268^2 .

It is not a de Polignac number, because 28328049 - 2⁷ = 28327921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28328849) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 174784 + ... + 174945.

It is an arithmetic number, because the mean of its divisors is an integer number (4231733).

Almost surely, 2^28328049 is an apocalyptic number.

It is an amenable number.

28328049 is a deficient number, since it is larger than the sum of its proper divisors (13989281).

28328049 is an equidigital number, since it uses as much as digits as its factorization.

28328049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349741 (or 349732 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28328049 is about 5322.4100743930. The cubic root of 28328049 is about 304.8401886062.

The spelling of 28328049 in words is "twenty-eight million, three hundred twenty-eight thousand, forty-nine".