28265609 has 2 divisors, whose sum is σ = 28265610. Its totient is φ = 28265608.

The previous prime is 28265593. The next prime is 28265617. The reversal of 28265609 is 90656282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 16384 = 5315^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 28265609 - 2⁴ = 28265593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28265639) 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, 14132804 + 14132805.

It is an arithmetic number, because the mean of its divisors is an integer number (14132805).

Almost surely, 2^28265609 is an apocalyptic number.

It is an amenable number.

28265609 is a deficient number, since it is larger than the sum of its proper divisors (1).

28265609 is an equidigital number, since it uses as much as digits as its factorization.

28265609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 28265609 is about 5316.5410747967. The cubic root of 28265609 is about 304.6160500566.

The spelling of 28265609 in words is "twenty-eight million, two hundred sixty-five thousand, six hundred nine".