728432 has 20 divisors (see below), whose sum is σ = 1439640. Its totient is φ = 356928.

The previous prime is 728423. The next prime is 728437. The reversal of 728432 is 234827.

728432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×728432² = 1061226357248, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7³ + 2⁵ + 4⁸ + 8 + 3¹² + 2¹⁷ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 728432.

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

728432 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 3 ways as a sum of consecutive naturals, for example, 419 + ... + 1277.

It is an arithmetic number, because the mean of its divisors is an integer number (71982).

2⁷²⁸⁴³² is an apocalyptic number.

It is an amenable number.

728432 is a deficient number, since it is larger than the sum of its proper divisors (711208).

728432 is a wasteful number, since it uses less digits than its factorization.

728432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920 (or 914 counting only the distinct ones).

The product of its digits is 2688, while the sum is 26.

The square root of 728432 is about 853.4822786678. The cubic root of 728432 is about 89.9766194410.

The spelling of 728432 in words is "seven hundred twenty-eight thousand, four hundred thirty-two".