428505 has 48 divisors (see below), whose sum is σ = 886464. Its totient is φ = 174720.

The previous prime is 428503. The next prime is 428509. The reversal of 428505 is 505824.

It is not a de Polignac number, because 428505 - 2¹ = 428503 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428505.

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 47 ways as a sum of consecutive naturals, for example, 8059 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

2⁴²⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

428505 is an abundant number, since it is smaller than the sum of its proper divisors (457959).

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

428505 is a wasteful number, since it uses less digits than its factorization.

428505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 428505 is about 654.6029330823. The cubic root of 428505 is about 75.3908485165.

The spelling of 428505 in words is "four hundred twenty-eight thousand, five hundred five".