28081118105 has 8 divisors (see below), whose sum is σ = 33943308552. Its totient is φ = 22300916608.

The previous prime is 28081118083. The next prime is 28081118129. The reversal of 28081118105 is 50181118082.

It can be written as a sum of positive squares in 4 ways, for example, as 4100737369 + 23980380736 = 64037^2 + 154856^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081118105 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 20496482 + ... + 20497851.

It is an arithmetic number, because the mean of its divisors is an integer number (4242913569).

Almost surely, 2^28081118105 is an apocalyptic number.

It is an amenable number.

28081118105 is a deficient number, since it is larger than the sum of its proper divisors (5862190447).

28081118105 is a wasteful number, since it uses less digits than its factorization.

28081118105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40994475.

The product of its (nonzero) digits is 5120, while the sum is 35.

The spelling of 28081118105 in words is "twenty-eight billion, eighty-one million, one hundred eighteen thousand, one hundred five".