28009013085 has 80 divisors (see below), whose sum is σ = 54165971376. Its totient is φ = 13793974272.

The previous prime is 28009013083. The next prime is 28009013093. The reversal of 28009013085 is 58031090082.

It can be written as a sum of positive squares in 8 ways, for example, as 4981254084 + 23027759001 = 70578^2 + 151749^2 .

It is not a de Polignac number, because 28009013085 - 2¹ = 28009013083 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28009013083) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 326527 + ... + 403283.

Almost surely, 2^28009013085 is an apocalyptic number.

It is an amenable number.

28009013085 is a deficient number, since it is larger than the sum of its proper divisors (26156958291).

28009013085 is a wasteful number, since it uses less digits than its factorization.

28009013085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76844 (or 76835 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 28009013085 in words is "twenty-eight billion, nine million, thirteen thousand, eighty-five".