728171 has 4 divisors (see below), whose sum is σ = 743712. Its totient is φ = 712632.

The previous prime is 728131. The next prime is 728173. The reversal of 728171 is 171827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728171 - 2¹⁸ = 466027 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 728171.

It is not an unprimeable number, because it can be changed into a prime (728173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7700 + ... + 7793.

It is an arithmetic number, because the mean of its divisors is an integer number (185928).

2⁷²⁸¹⁷¹ is an apocalyptic number.

728171 is a deficient number, since it is larger than the sum of its proper divisors (15541).

728171 is a wasteful number, since it uses less digits than its factorization.

728171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15540.

The product of its digits is 784, while the sum is 26.

The square root of 728171 is about 853.3293619699. The cubic root of 728171 is about 89.9658718338.

Adding to 728171 its reverse (171827), we get a palindrome (899998).

The spelling of 728171 in words is "seven hundred twenty-eight thousand, one hundred seventy-one".