28681000509 has 96 divisors (see below), whose sum is σ = 48587091840. Its totient is φ = 14945968128.

The previous prime is 28681000507. The next prime is 28681000519. The reversal of 28681000509 is 90500018682.

It is not a de Polignac number, because 28681000509 - 2¹ = 28681000507 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 (28681000501) 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 in 95 ways as a sum of consecutive naturals, for example, 10991797 + ... + 10994405.

It is an arithmetic number, because the mean of its divisors is an integer number (506115540).

Almost surely, 2^28681000509 is an apocalyptic number.

It is an amenable number.

28681000509 is a deficient number, since it is larger than the sum of its proper divisors (19906091331).

28681000509 is a wasteful number, since it uses less digits than its factorization.

28681000509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2772 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 28681000509 in words is "twenty-eight billion, six hundred eighty-one million, five hundred nine", and thus it is an aban number.