428784 has 20 divisors (see below), whose sum is σ = 1107816. Its totient is φ = 142912.

The previous prime is 428777. The next prime is 428797. The reversal of 428784 is 487824.

428784 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 428784.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4419 + ... + 4514.

2⁴²⁸⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

428784 is an abundant number, since it is smaller than the sum of its proper divisors (679032).

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

428784 is a wasteful number, since it uses less digits than its factorization.

428784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8944 (or 8938 counting only the distinct ones).

The product of its digits is 14336, while the sum is 33.

The square root of 428784 is about 654.8160046914. The cubic root of 428784 is about 75.4072073169.

It can be divided in two parts, 4287 and 84, that added together give a triangular number (4371 = T₉₃).

The spelling of 428784 in words is "four hundred twenty-eight thousand, seven hundred eighty-four".