728438 has 12 divisors (see below), whose sum is σ = 1132020. Its totient is φ = 351540.

The previous prime is 728437. The next prime is 728471. The reversal of 728438 is 834827.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1733 + ... + 2111.

It is an arithmetic number, because the mean of its divisors is an integer number (94335).

2⁷²⁸⁴³⁸ is an apocalyptic number.

728438 is a deficient number, since it is larger than the sum of its proper divisors (403582).

728438 is a wasteful number, since it uses less digits than its factorization.

728438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 412 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 728438 is about 853.4857936720. The cubic root of 728438 is about 89.9768664823.

The spelling of 728438 in words is "seven hundred twenty-eight thousand, four hundred thirty-eight".