728738 has 8 divisors (see below), whose sum is σ = 1099200. Its totient is φ = 362340.

The previous prime is 728731. The next prime is 728743. The reversal of 728738 is 837827.

It is a happy number.

728738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 728698 and 728707.

It is not an unprimeable number, because it can be changed into a prime (728731) by changing a digit.

728738 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 in 3 ways as a sum of consecutive naturals, for example, 518 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (137400).

2⁷²⁸⁷³⁸ is an apocalyptic number.

728738 is a deficient number, since it is larger than the sum of its proper divisors (370462).

728738 is a wasteful number, since it uses less digits than its factorization.

728738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032.

The product of its digits is 18816, while the sum is 35.

The square root of 728738 is about 853.6615254303. The cubic root of 728738 is about 89.9892168151.

The spelling of 728738 in words is "seven hundred twenty-eight thousand, seven hundred thirty-eight".