728258 has 4 divisors (see below), whose sum is σ = 1092390. Its totient is φ = 364128.

The previous prime is 728209. The next prime is 728261. The reversal of 728258 is 852827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 537289 + 190969 = 733^2 + 437^2 .

It is a d-powerful number, because it can be written as 7⁶ + 2² + 2¹⁹ + 8⁴ + 5⁷ + 8⁴ .

It is a Curzon number.

It is an unprimeable number.

728258 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 as a sum of consecutive naturals, namely, 182063 + ... + 182066.

2⁷²⁸²⁵⁸ is an apocalyptic number.

728258 is a deficient number, since it is larger than the sum of its proper divisors (364132).

728258 is a wasteful number, since it uses less digits than its factorization.

728258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364131.

The product of its digits is 8960, while the sum is 32.

The square root of 728258 is about 853.3803372471. The cubic root of 728258 is about 89.9694546549.

The spelling of 728258 in words is "seven hundred twenty-eight thousand, two hundred fifty-eight".