28303109 has 2 divisors, whose sum is σ = 28303110. Its totient is φ = 28303108.

The previous prime is 28303091. The next prime is 28303117. The reversal of 28303109 is 90130382.

Together with previous prime (28303091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 5712100 = 4753^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28303109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28303139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14151554 + 14151555.

It is an arithmetic number, because the mean of its divisors is an integer number (14151555).

Almost surely, 2^28303109 is an apocalyptic number.

It is an amenable number.

28303109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28303109 is an equidigital number, since it uses as much as digits as its factorization.

28303109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 28303109 is about 5320.0666349210. The cubic root of 28303109 is about 304.7507019571.

The spelling of 28303109 in words is "twenty-eight million, three hundred three thousand, one hundred nine".