85728173 has 8 divisors (see below), whose sum is σ = 86754360. Its totient is φ = 84706560.

The previous prime is 85728157. The next prime is 85728179. The reversal of 85728173 is 37182758.

It can be written as a sum of positive squares in 4 ways, for example, as 46063369 + 39664804 = 6787^2 + 6298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85728173 - 2⁴ = 85728157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85728173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85728179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48953 + ... + 50673.

It is an arithmetic number, because the mean of its divisors is an integer number (10844295).

Almost surely, 2^85728173 is an apocalyptic number.

It is an amenable number.

85728173 is a deficient number, since it is larger than the sum of its proper divisors (1026187).

85728173 is a wasteful number, since it uses less digits than its factorization.

85728173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2287.

The product of its digits is 94080, while the sum is 41.

The square root of 85728173 is about 9258.9509664972. The cubic root of 85728173 is about 440.9349489184.

The spelling of 85728173 in words is "eighty-five million, seven hundred twenty-eight thousand, one hundred seventy-three".