28028219085 has 12 divisors (see below), whose sum is σ = 48582246492. Its totient is φ = 14948383488.

The previous prime is 28028219041. The next prime is 28028219123. The reversal of 28028219085 is 58091282082.

28028219085 is a `hidden beast` number, since 280 + 282 + 1 + 90 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21969464841 + 6058754244 = 148221^2 + 77838^2 .

It is not a de Polignac number, because 28028219085 - 2¹³ = 28028210893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 622849313 = 28028219085 / (2 + 8 + 0 + 2 + 8 + 2 + 1 + 9 + 0 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28028219085.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 311424612 + ... + 311424701.

It is an arithmetic number, because the mean of its divisors is an integer number (4048520541).

Almost surely, 2^28028219085 is an apocalyptic number.

It is an amenable number.

28028219085 is a deficient number, since it is larger than the sum of its proper divisors (20554027407).

28028219085 is a wasteful number, since it uses less digits than its factorization.

28028219085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622849324 (or 622849321 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 28028219085 in words is "twenty-eight billion, twenty-eight million, two hundred nineteen thousand, eighty-five".