28178686730085 has 16 divisors (see below), whose sum is σ = 45086360709120. Its totient is φ = 15028478942400.

The previous prime is 28178686730071. The next prime is 28178686730093. The reversal of 28178686730085 is 58003768687182.

It is not a de Polignac number, because 28178686730085 - 2¹⁸ = 28178686467941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8103205 + ... + 11046234.

It is an arithmetic number, because the mean of its divisors is an integer number (2817897544320).

Almost surely, 2^{28178686730085} is an apocalyptic number.

It is an amenable number.

28178686730085 is a deficient number, since it is larger than the sum of its proper divisors (16907673979035).

28178686730085 is a wasteful number, since it uses less digits than its factorization.

28178686730085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19247548.

The product of its (nonzero) digits is 216760320, while the sum is 69.

The spelling of 28178686730085 in words is "twenty-eight trillion, one hundred seventy-eight billion, six hundred eighty-six million, seven hundred thirty thousand, eighty-five".