728564 has 6 divisors (see below), whose sum is σ = 1274994. Its totient is φ = 364280.

The previous prime is 728561. The next prime is 728573. The reversal of 728564 is 465827.

It can be written as a sum of positive squares in only one way, i.e., 708964 + 19600 = 842^2 + 140^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 728564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91067 + ... + 91074.

It is an arithmetic number, because the mean of its divisors is an integer number (212499).

2⁷²⁸⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

728564 is a deficient number, since it is larger than the sum of its proper divisors (546430).

728564 is a wasteful number, since it uses less digits than its factorization.

728564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182145 (or 182143 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 728564 is about 853.5596054172. The cubic root of 728564 is about 89.9820540350.

The spelling of 728564 in words is "seven hundred twenty-eight thousand, five hundred sixty-four".