28161108205 has 16 divisors (see below), whose sum is σ = 34724116224. Its totient is φ = 21914245440.

The previous prime is 28161108203. The next prime is 28161108223. The reversal of 28161108205 is 50280116182.

It is not a de Polignac number, because 28161108205 - 2¹ = 28161108203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28161108203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329286 + ... + 405895.

It is an arithmetic number, because the mean of its divisors is an integer number (2170257264).

Almost surely, 2^28161108205 is an apocalyptic number.

It is an amenable number.

28161108205 is a deficient number, since it is larger than the sum of its proper divisors (6563008019).

28161108205 is a wasteful number, since it uses less digits than its factorization.

28161108205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735396.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 28161108205 in words is "twenty-eight billion, one hundred sixty-one million, one hundred eight thousand, two hundred five".