728164 has 6 divisors (see below), whose sum is σ = 1274294. Its totient is φ = 364080.

The previous prime is 728131. The next prime is 728173. The reversal of 728164 is 461827.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 209764 = 720^2 + 458^2 .

It is an unprimeable number.

728164 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91017 + ... + 91024.

2⁷²⁸¹⁶⁴ is an apocalyptic number.

It is an amenable number.

728164 is a deficient number, since it is larger than the sum of its proper divisors (546130).

728164 is a wasteful number, since it uses less digits than its factorization.

728164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182045 (or 182043 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 728164 is about 853.3252603785. The cubic root of 728164 is about 89.9655835485.

The spelling of 728164 in words is "seven hundred twenty-eight thousand, one hundred sixty-four".