728456 has 32 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 335808.

The previous prime is 728437. The next prime is 728471. The reversal of 728456 is 654827.

It is an unprimeable number.

728456 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 7 ways as a sum of consecutive naturals, for example, 6755 + ... + 6861.

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

2⁷²⁸⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

728456 is an abundant number, since it is smaller than the sum of its proper divisors (748984).

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

728456 is a wasteful number, since it uses less digits than its factorization.

728456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 169 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 728456 is about 853.4963385979. The cubic root of 728456 is about 89.9776075979.

The spelling of 728456 in words is "seven hundred twenty-eight thousand, four hundred fifty-six".