28406565709 has 2 divisors, whose sum is σ = 28406565710. Its totient is φ = 28406565708.

The previous prime is 28406565697. The next prime is 28406565727. The reversal of 28406565709 is 90756560482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20310525225 + 8096040484 = 142515^2 + 89978^2 .

It is a cyclic number.

It is not a de Polignac number, because 28406565709 - 2¹⁵ = 28406532941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28406566709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14203282854 + 14203282855.

It is an arithmetic number, because the mean of its divisors is an integer number (14203282855).

Almost surely, 2^28406565709 is an apocalyptic number.

It is an amenable number.

28406565709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28406565709 is an equidigital number, since it uses as much as digits as its factorization.

28406565709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 28406565709 in words is "twenty-eight billion, four hundred six million, five hundred sixty-five thousand, seven hundred nine".