428268561 has 16 divisors (see below), whose sum is σ = 652953600. Its totient is φ = 244592208.

The previous prime is 428268523. The next prime is 428268563. The reversal of 428268561 is 165862824.

It is not a de Polignac number, because 428268561 - 2¹⁰ = 428267537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428268563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44760 + ... + 53478.

It is an arithmetic number, because the mean of its divisors is an integer number (40809600).

Almost surely, 2^428268561 is an apocalyptic number.

It is an amenable number.

428268561 is a deficient number, since it is larger than the sum of its proper divisors (224685039).

428268561 is a wasteful number, since it uses less digits than its factorization.

428268561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11068.

The product of its digits is 184320, while the sum is 42.

The square root of 428268561 is about 20694.6505406591. The cubic root of 428268561 is about 753.7697966523.

The spelling of 428268561 in words is "four hundred twenty-eight million, two hundred sixty-eight thousand, five hundred sixty-one".