28386440009 has 2 divisors, whose sum is σ = 28386440010. Its totient is φ = 28386440008.

The previous prime is 28386439993. The next prime is 28386440101. The reversal of 28386440009 is 90004468382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24861405625 + 3525034384 = 157675^2 + 59372^2 .

It is a cyclic number.

It is not a de Polignac number, because 28386440009 - 2⁴ = 28386439993 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 (28386440209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14193220004 + 14193220005.

It is an arithmetic number, because the mean of its divisors is an integer number (14193220005).

Almost surely, 2^28386440009 is an apocalyptic number.

It is an amenable number.

28386440009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28386440009 is an equidigital number, since it uses as much as digits as its factorization.

28386440009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 28386440009 in words is "twenty-eight billion, three hundred eighty-six million, four hundred forty thousand, nine".