728684 has 12 divisors (see below), whose sum is σ = 1391208. Its totient is φ = 331200.

The previous prime is 728681. The next prime is 728687. The reversal of 728684 is 486827.

It is an interprime number because it is at equal distance from previous prime (728681) and next prime (728687).

It is not an unprimeable number, because it can be changed into a prime (728681) 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, 8237 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (115934).

2⁷²⁸⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

728684 is a deficient number, since it is larger than the sum of its proper divisors (662524).

728684 is a wasteful number, since it uses less digits than its factorization.

728684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16576 (or 16574 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 728684 is about 853.6298963837. The cubic root of 728684 is about 89.9869940054.

The spelling of 728684 in words is "seven hundred twenty-eight thousand, six hundred eighty-four".