28140205686 has 16 divisors (see below), whose sum is σ = 56282784768. Its totient is φ = 9379673000.

The previous prime is 28140205679. The next prime is 28140205693. The reversal of 28140205686 is 68650204182.

28140205686 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (28140205679) and next prime (28140205693).

It is a congruent 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, 80191 + ... + 250421.

It is an arithmetic number, because the mean of its divisors is an integer number (3517674048).

Almost surely, 2^28140205686 is an apocalyptic number.

28140205686 is an abundant number, since it is smaller than the sum of its proper divisors (28142579082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28140205686 is a wasteful number, since it uses less digits than its factorization.

28140205686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197787.

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 28140205686 in words is "twenty-eight billion, one hundred forty million, two hundred five thousand, six hundred eighty-six".