28105386661 has 8 divisors (see below), whose sum is σ = 31118040864. Its totient is φ = 25169002320.

The previous prime is 28105386619. The next prime is 28105386667. The reversal of 28105386661 is 16668350182.

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

It is not a de Polignac number, because 28105386661 - 2⁹ = 28105386149 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 (28105386667) 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 7 ways as a sum of consecutive naturals, for example, 19066690 + ... + 19068163.

It is an arithmetic number, because the mean of its divisors is an integer number (3889755108).

Almost surely, 2^28105386661 is an apocalyptic number.

It is an amenable number.

28105386661 is a deficient number, since it is larger than the sum of its proper divisors (3012654203).

28105386661 is a wasteful number, since it uses less digits than its factorization.

28105386661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38134931.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 28105386661 in words is "twenty-eight billion, one hundred five million, three hundred eighty-six thousand, six hundred sixty-one".