428569 has 2 divisors, whose sum is σ = 428570. Its totient is φ = 428568.

The previous prime is 428567. The next prime is 428579. The reversal of 428569 is 965824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 12544 = 645^2 + 112^2 .

It is a cyclic number.

It is not a de Polignac number, because 428569 - 2¹ = 428567 is a prime.

It is a super-2 number, since 2×428569² = 367342775522, which contains 22 as substring.

Together with 428567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (428563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214284 + 214285.

It is an arithmetic number, because the mean of its divisors is an integer number (214285).

2⁴²⁸⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

428569 is a deficient number, since it is larger than the sum of its proper divisors (1).

428569 is an equidigital number, since it uses as much as digits as its factorization.

428569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 428569 is about 654.6518158533. The cubic root of 428569 is about 75.3946017004.

The spelling of 428569 in words is "four hundred twenty-eight thousand, five hundred sixty-nine".