728345 has 16 divisors (see below), whose sum is σ = 933888. Its totient is φ = 544320.

The previous prime is 728333. The next prime is 728369. The reversal of 728345 is 543827.

It is a happy number.

728345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 728345 - 2⁶ = 728281 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728345.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5672 + ... + 5798.

It is an arithmetic number, because the mean of its divisors is an integer number (58368).

2⁷²⁸³⁴⁵ is an apocalyptic number.

It is an amenable number.

728345 is a deficient number, since it is larger than the sum of its proper divisors (205543).

728345 is a wasteful number, since it uses less digits than its factorization.

728345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200.

The product of its digits is 6720, while the sum is 29.

The square root of 728345 is about 853.4313094796. The cubic root of 728345 is about 89.9730371906.

The spelling of 728345 in words is "seven hundred twenty-eight thousand, three hundred forty-five".