28260109 has 2 divisors, whose sum is σ = 28260110. Its totient is φ = 28260108.

The previous prime is 28260083. The next prime is 28260161. The reversal of 28260109 is 90106282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28196100 + 64009 = 5310^2 + 253^2 .

It is a cyclic number.

It is not a de Polignac number, because 28260109 - 2⁹ = 28259597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28260179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130054 + 14130055.

It is an arithmetic number, because the mean of its divisors is an integer number (14130055).

Almost surely, 2^28260109 is an apocalyptic number.

It is an amenable number.

28260109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28260109 is an equidigital number, since it uses as much as digits as its factorization.

28260109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28260109 is about 5316.0237960340. The cubic root of 28260109 is about 304.5962910984.

The spelling of 28260109 in words is "twenty-eight million, two hundred sixty thousand, one hundred nine".