28081803765 has 16 divisors (see below), whose sum is σ = 45435729600. Its totient is φ = 14808680832.

The previous prime is 28081803691. The next prime is 28081803767. The reversal of 28081803765 is 56730818082.

It is not a de Polignac number, because 28081803765 - 2⁷ = 28081803637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081803767) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10516195 + ... + 10518864.

It is an arithmetic number, because the mean of its divisors is an integer number (2839733100).

Almost surely, 2^28081803765 is an apocalyptic number.

It is an amenable number.

28081803765 is a deficient number, since it is larger than the sum of its proper divisors (17353925835).

28081803765 is a wasteful number, since it uses less digits than its factorization.

28081803765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21035156.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 28081803765 in words is "twenty-eight billion, eighty-one million, eight hundred three thousand, seven hundred sixty-five".