28088009 has 2 divisors, whose sum is σ = 28088010. Its totient is φ = 28088008.

The previous prime is 28088003. The next prime is 28088041. The reversal of 28088009 is 90088082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24720784 + 3367225 = 4972^2 + 1835^2 .

It is a cyclic number.

It is not a de Polignac number, because 28088009 - 2⁸ = 28087753 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28088009.

It is not a weakly prime, because it can be changed into another prime (28088003) 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 as a sum of consecutive naturals, namely, 14044004 + 14044005.

It is an arithmetic number, because the mean of its divisors is an integer number (14044005).

Almost surely, 2^28088009 is an apocalyptic number.

It is an amenable number.

28088009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28088009 is an equidigital number, since it uses as much as digits as its factorization.

28088009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 28088009 is about 5299.8121664829. The cubic root of 28088009 is about 303.9767158124.

The spelling of 28088009 in words is "twenty-eight million, eighty-eight thousand, nine".