428567 has 2 divisors, whose sum is σ = 428568. Its totient is φ = 428566.

The previous prime is 428563. The next prime is 428569. The reversal of 428567 is 765824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428567 - 2² = 428563 is a prime.

Together with 428569, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

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, 214283 + 214284.

It is an arithmetic number, because the mean of its divisors is an integer number (214284).

2⁴²⁸⁵⁶⁷ is an apocalyptic number.

428567 is a deficient number, since it is larger than the sum of its proper divisors (1).

428567 is an equidigital number, since it uses as much as digits as its factorization.

428567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 428567 is about 654.6502883219. The cubic root of 428567 is about 75.3944844190.

It can be divided in two parts, 42856 and 7, that multiplied together give a palindrome (299992).

The spelling of 428567 in words is "four hundred twenty-eight thousand, five hundred sixty-seven".