428508 has 18 divisors (see below), whose sum is σ = 1083264. Its totient is φ = 142824.

The previous prime is 428503. The next prime is 428509. The reversal of 428508 is 805824.

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428503) 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, 5916 + ... + 5987.

2⁴²⁸⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

428508 is an abundant number, since it is smaller than the sum of its proper divisors (654756).

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

428508 is a wasteful number, since it uses less digits than its factorization.

428508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11913 (or 11908 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 428508 is about 654.6052245438. The cubic root of 428508 is about 75.3910244554.

The spelling of 428508 in words is "four hundred twenty-eight thousand, five hundred eight".