85172728 has 8 divisors (see below), whose sum is σ = 159698880. Its totient is φ = 42586360.

The previous prime is 85172719. The next prime is 85172761. The reversal of 85172728 is 82727158.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent 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 as a sum of consecutive naturals, namely, 5323288 + ... + 5323303.

It is an arithmetic number, because the mean of its divisors is an integer number (19962360).

Almost surely, 2^85172728 is an apocalyptic number.

It is an amenable number.

85172728 is a deficient number, since it is larger than the sum of its proper divisors (74526152).

85172728 is a wasteful number, since it uses less digits than its factorization.

85172728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646597 (or 10646593 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 85172728 is about 9228.9071942457. The cubic root of 85172728 is about 439.9805914304.

The spelling of 85172728 in words is "eighty-five million, one hundred seventy-two thousand, seven hundred twenty-eight".