28565857686 has 16 divisors (see below), whose sum is σ = 60138648000. Its totient is φ = 9020797128.

The previous prime is 28565857681. The next prime is 28565857693. The reversal of 28565857686 is 68675856582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565857681) 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, 125288736 + ... + 125288963.

It is an arithmetic number, because the mean of its divisors is an integer number (3758665500).

Almost surely, 2^28565857686 is an apocalyptic number.

28565857686 is an abundant number, since it is smaller than the sum of its proper divisors (31572790314).

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

28565857686 is a wasteful number, since it uses less digits than its factorization.

28565857686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250577723.

The product of its digits is 193536000, while the sum is 66.

The spelling of 28565857686 in words is "twenty-eight billion, five hundred sixty-five million, eight hundred fifty-seven thousand, six hundred eighty-six".