428781589 has 2 divisors, whose sum is σ = 428781590. Its totient is φ = 428781588.

The previous prime is 428781583. The next prime is 428781593. The reversal of 428781589 is 985187824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395811025 + 32970564 = 19895^2 + 5742^2 .

It is a cyclic number.

It is not a de Polignac number, because 428781589 - 2²³ = 420392981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428781583) 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 as a sum of consecutive naturals, namely, 214390794 + 214390795.

It is an arithmetic number, because the mean of its divisors is an integer number (214390795).

Almost surely, 2^428781589 is an apocalyptic number.

It is an amenable number.

428781589 is a deficient number, since it is larger than the sum of its proper divisors (1).

428781589 is an equidigital number, since it uses as much as digits as its factorization.

428781589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 52.

The square root of 428781589 is about 20707.0420147350. The cubic root of 428781589 is about 754.0706598149.

The spelling of 428781589 in words is "four hundred twenty-eight million, seven hundred eighty-one thousand, five hundred eighty-nine".