428728 has 8 divisors (see below), whose sum is σ = 803880. Its totient is φ = 214360.

The previous prime is 428693. The next prime is 428731. The reversal of 428728 is 827824.

428728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 428728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26788 + ... + 26803.

It is an arithmetic number, because the mean of its divisors is an integer number (100485).

2⁴²⁸⁷²⁸ is an apocalyptic number.

It is an amenable number.

428728 is a deficient number, since it is larger than the sum of its proper divisors (375152).

428728 is a wasteful number, since it uses less digits than its factorization.

428728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53597 (or 53593 counting only the distinct ones).

The product of its digits is 7168, while the sum is 31.

The square root of 428728 is about 654.7732431919. The cubic root of 428728 is about 75.4039243994.

It can be divided in two parts, 428 and 728, that added together give a square (1156 = 34²).

The spelling of 428728 in words is "four hundred twenty-eight thousand, seven hundred twenty-eight".