728018 has 8 divisors (see below), whose sum is σ = 1100412. Its totient is φ = 361216.

The previous prime is 728017. The next prime is 728027. The reversal of 728018 is 810827.

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 10609 = 847^2 + 103^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (728017) 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, 1055 + ... + 1602.

2⁷²⁸⁰¹⁸ is an apocalyptic number.

728018 is a deficient number, since it is larger than the sum of its proper divisors (372394).

728018 is a wasteful number, since it uses less digits than its factorization.

728018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 728018 is about 853.2397084056. The cubic root of 728018 is about 89.9595703183.

The spelling of 728018 in words is "seven hundred twenty-eight thousand, eighteen".