428857789 has 2 divisors, whose sum is σ = 428857790. Its totient is φ = 428857788.

The previous prime is 428857769. The next prime is 428857811. The reversal of 428857789 is 987758824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395333689 + 33524100 = 19883^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 428857789 - 2⁵ = 428857757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428857769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214428894 + 214428895.

It is an arithmetic number, because the mean of its divisors is an integer number (214428895).

Almost surely, 2^428857789 is an apocalyptic number.

It is an amenable number.

428857789 is a deficient number, since it is larger than the sum of its proper divisors (1).

428857789 is an equidigital number, since it uses as much as digits as its factorization.

428857789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9031680, while the sum is 58.

The square root of 428857789 is about 20708.8818867654. The cubic root of 428857789 is about 754.1153265187.

The spelling of 428857789 in words is "four hundred twenty-eight million, eight hundred fifty-seven thousand, seven hundred eighty-nine".