28365109 has 2 divisors, whose sum is σ = 28365110. Its totient is φ = 28365108.

The previous prime is 28365091. The next prime is 28365121. The reversal of 28365109 is 90156382.

Together with previous prime (28365091) 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., 15563025 + 12802084 = 3945^2 + 3578^2 .

It is a cyclic number.

It is not a de Polignac number, because 28365109 - 2¹¹ = 28363061 is a prime.

It is equal to p_1762729 and since 28365109 and 1762729 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28365149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14182554 + 14182555.

It is an arithmetic number, because the mean of its divisors is an integer number (14182555).

Almost surely, 2^28365109 is an apocalyptic number.

It is an amenable number.

28365109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28365109 is an equidigital number, since it uses as much as digits as its factorization.

28365109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28365109 is about 5325.8904419824. The cubic root of 28365109 is about 304.9730657932.

The spelling of 28365109 in words is "twenty-eight million, three hundred sixty-five thousand, one hundred nine".