728123 has 8 divisors (see below), whose sum is σ = 816240. Its totient is φ = 643680.

The previous prime is 728113. The next prime is 728129. The reversal of 728123 is 321827.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728129) 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 7 ways as a sum of consecutive naturals, for example, 488 + ... + 1301.

It is an arithmetic number, because the mean of its divisors is an integer number (102030).

2⁷²⁸¹²³ is an apocalyptic number.

728123 is a deficient number, since it is larger than the sum of its proper divisors (88117).

728123 is a wasteful number, since it uses less digits than its factorization.

728123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837.

The product of its digits is 672, while the sum is 23.

The square root of 728123 is about 853.3012363755. The cubic root of 728123 is about 89.9638949828.

The spelling of 728123 in words is "seven hundred twenty-eight thousand, one hundred twenty-three".