28136785 has 16 divisors (see below), whose sum is σ = 36516096. Its totient is φ = 20731648.

The previous prime is 28136743. The next prime is 28136807. The reversal of 28136785 is 58763182.

It is a cyclic number.

It is not a de Polignac number, because 28136785 - 2¹¹ = 28134737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474 + ... + 7516.

It is an arithmetic number, because the mean of its divisors is an integer number (2282256).

Almost surely, 2^28136785 is an apocalyptic number.

It is an amenable number.

28136785 is a deficient number, since it is larger than the sum of its proper divisors (8379311).

28136785 is a wasteful number, since it uses less digits than its factorization.

28136785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112.

The product of its digits is 80640, while the sum is 40.

The square root of 28136785 is about 5304.4118429850. The cubic root of 28136785 is about 304.1525701438.

The spelling of 28136785 in words is "twenty-eight million, one hundred thirty-six thousand, seven hundred eighty-five".