728440 has 16 divisors (see below), whose sum is σ = 1639080. Its totient is φ = 291360.

The previous prime is 728437. The next prime is 728471. The reversal of 728440 is 44827.

It is a congruent number.

It is an unprimeable number.

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, 9066 + ... + 9145.

2⁷²⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

728440 is an abundant number, since it is smaller than the sum of its proper divisors (910640).

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

728440 is a wasteful number, since it uses less digits than its factorization.

728440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18222 (or 18218 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 728440 is about 853.4869653369. The cubic root of 728440 is about 89.9769488291.

The spelling of 728440 in words is "seven hundred twenty-eight thousand, four hundred forty".