28020846605 has 6 divisors (see below), whose sum is σ = 33625465098. Its totient is φ = 22416377840.

The previous prime is 28020846569. The next prime is 28020846611. The reversal of 28020846605 is 50664802082.

It can be written as a sum of positive squares in 3 ways, for example, as 12728803684 + 15292042921 = 112822^2 + 123661^2 .

It is not a de Polignac number, because 28020846605 - 2⁶ = 28020846541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 336875 + ... + 411735.

It is an arithmetic number, because the mean of its divisors is an integer number (5604244183).

Almost surely, 2^28020846605 is an apocalyptic number.

It is an amenable number.

28020846605 is a deficient number, since it is larger than the sum of its proper divisors (5604618493).

28020846605 is an frugal number, since it uses more digits than its factorization.

28020846605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149727 (or 74866 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 28020846605 in words is "twenty-eight billion, twenty million, eight hundred forty-six thousand, six hundred five".