28909731805 has 8 divisors (see below), whose sum is σ = 34693164000. Its totient is φ = 23126794896.

The previous prime is 28909731797. The next prime is 28909731841. The reversal of 28909731805 is 50813790982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28909731805 - 2³ = 28909731797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19726 + ... + 241264.

It is an arithmetic number, because the mean of its divisors is an integer number (4336645500).

Almost surely, 2^28909731805 is an apocalyptic number.

It is an amenable number.

28909731805 is a deficient number, since it is larger than the sum of its proper divisors (5783432195).

28909731805 is a wasteful number, since it uses less digits than its factorization.

28909731805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247643.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 28909731805 in words is "twenty-eight billion, nine hundred nine million, seven hundred thirty-one thousand, eight hundred five".