428305 has 4 divisors (see below), whose sum is σ = 513972. Its totient is φ = 342640.

The previous prime is 428303. The next prime is 428339. The reversal of 428305 is 503824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 350464 = 279^2 + 592^2 .

It is not a de Polignac number, because 428305 - 2¹ = 428303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42826 + ... + 42835.

It is an arithmetic number, because the mean of its divisors is an integer number (128493).

2⁴²⁸³⁰⁵ is an apocalyptic number.

It is an amenable number.

428305 is a deficient number, since it is larger than the sum of its proper divisors (85667).

428305 is an equidigital number, since it uses as much as digits as its factorization.

428305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85666.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 428305 is about 654.4501508900. The cubic root of 428305 is about 75.3791174078.

The spelling of 428305 in words is "four hundred twenty-eight thousand, three hundred five".