28085926805 has 16 divisors (see below), whose sum is σ = 34777182384. Its totient is φ = 21760696320.

The previous prime is 28085926733. The next prime is 28085926823. The reversal of 28085926805 is 50862958082.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3064065316 + 25021861489 = 55354^2 + 158183^2 .

It is not a de Polignac number, because 28085926805 - 2¹⁸ = 28085664661 is a prime.

It is a Duffinian number.

28085926805 is a modest number, since divided by 926805 gives 28085 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471932 + ... + 528101.

It is an arithmetic number, because the mean of its divisors is an integer number (2173573899).

Almost surely, 2^28085926805 is an apocalyptic number.

It is an amenable number.

28085926805 is a deficient number, since it is larger than the sum of its proper divisors (6691255579).

28085926805 is a wasteful number, since it uses less digits than its factorization.

28085926805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000216.

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 28085926805 in words is "twenty-eight billion, eighty-five million, nine hundred twenty-six thousand, eight hundred five".