165728 has 12 divisors (see below), whose sum is σ = 326340. Its totient is φ = 82848.

The previous prime is 165721. The next prime is 165749. The reversal of 165728 is 827561.

It is an Ulam number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 165728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2558 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (27195).

2¹⁶⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

165728 is a deficient number, since it is larger than the sum of its proper divisors (160612).

165728 is an equidigital number, since it uses as much as digits as its factorization.

165728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189 (or 5181 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 165728 is about 407.0970400285. The cubic root of 165728 is about 54.9286126168.

The spelling of 165728 in words is "one hundred sixty-five thousand, seven hundred twenty-eight".