28888109 has 2 divisors, whose sum is σ = 28888110. Its totient is φ = 28888108.

The previous prime is 28888103. The next prime is 28888129. The reversal of 28888109 is 90188882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24900100 + 3988009 = 4990^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 28888109 - 2⁸ = 28887853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28888109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28888103) 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, 14444054 + 14444055.

It is an arithmetic number, because the mean of its divisors is an integer number (14444055).

Almost surely, 2^28888109 is an apocalyptic number.

It is an amenable number.

28888109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28888109 is an equidigital number, since it uses as much as digits as its factorization.

28888109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 28888109 is about 5374.7659483925. The cubic root of 28888109 is about 306.8360415698.

The spelling of 28888109 in words is "twenty-eight million, eight hundred eighty-eight thousand, one hundred nine".