85638728 has 16 divisors (see below), whose sum is σ = 183511680. Its totient is φ = 36702288.

The previous prime is 85638703. The next prime is 85638779. The reversal of 85638728 is 82783658.

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 3 ways as a sum of consecutive naturals, for example, 764576 + ... + 764687.

It is an arithmetic number, because the mean of its divisors is an integer number (11469480).

Almost surely, 2^85638728 is an apocalyptic number.

It is an amenable number.

85638728 is an abundant number, since it is smaller than the sum of its proper divisors (97872952).

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

85638728 is a wasteful number, since it uses less digits than its factorization.

85638728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529276 (or 1529272 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 85638728 is about 9254.1195151133. The cubic root of 85638728 is about 440.7815448525.

The spelling of 85638728 in words is "eighty-five million, six hundred thirty-eight thousand, seven hundred twenty-eight".