728530 has 32 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 256320.

The previous prime is 728527. The next prime is 728537. The reversal of 728530 is 35827.

It is a junction number, because it is equal to n+sod(n) for n = 728495 and 728504.

It is not an unprimeable number, because it can be changed into a prime (728537) 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 15 ways as a sum of consecutive naturals, for example, 3981 + ... + 4159.

It is an arithmetic number, because the mean of its divisors is an integer number (46170).

2⁷²⁸⁵³⁰ is an apocalyptic number.

728530 is an abundant number, since it is smaller than the sum of its proper divisors (748910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728530 is a wasteful number, since it uses less digits than its factorization.

728530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 728530 is about 853.5396885910. The cubic root of 728530 is about 89.9806542781.

The spelling of 728530 in words is "seven hundred twenty-eight thousand, five hundred thirty".