28685574151686 has 24 divisors (see below), whose sum is σ = 62235727529040. Its totient is φ = 9548988788976.

The previous prime is 28685574151679. The next prime is 28685574151687. The reversal of 28685574151686 is 68615147558682.

It is a happy number.

28685574151686 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 557 + 4 + 1 + 5 + 1 + 68 + 6 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28685574151687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1072424721 + ... + 1072451468.

It is an arithmetic number, because the mean of its divisors is an integer number (2593155313710).

Almost surely, 2^{28685574151686} is an apocalyptic number.

28685574151686 is an abundant number, since it is smaller than the sum of its proper divisors (33550153377354).

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

28685574151686 is a wasteful number, since it uses less digits than its factorization.

28685574151686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144876940 (or 2144876937 counting only the distinct ones).

The product of its digits is 774144000, while the sum is 72.

The spelling of 28685574151686 in words is "twenty-eight trillion, six hundred eighty-five billion, five hundred seventy-four million, one hundred fifty-one thousand, six hundred eighty-six".