428775889 has 2 divisors, whose sum is σ = 428775890. Its totient is φ = 428775888.

The previous prime is 428775803. The next prime is 428775917. The reversal of 428775889 is 988577824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411278400 + 17497489 = 20280^2 + 4183^2 .

It is a cyclic number.

It is not a de Polignac number, because 428775889 - 2¹¹ = 428773841 is a prime.

It is not a weakly prime, because it can be changed into another prime (428776889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214387944 + 214387945.

It is an arithmetic number, because the mean of its divisors is an integer number (214387945).

Almost surely, 2^428775889 is an apocalyptic number.

It is an amenable number.

428775889 is a deficient number, since it is larger than the sum of its proper divisors (1).

428775889 is an equidigital number, since it uses as much as digits as its factorization.

428775889 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 428775889 is about 20706.9043799405. The cubic root of 428775889 is about 754.0673183920.

The spelling of 428775889 in words is "four hundred twenty-eight million, seven hundred seventy-five thousand, eight hundred eighty-nine".