628363889 has 2 divisors, whose sum is σ = 628363890. Its totient is φ = 628363888.

The previous prime is 628363847. The next prime is 628363913. The reversal of 628363889 is 988363826.

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., 603193600 + 25170289 = 24560^2 + 5017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628363889 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 628363889.

It is not a weakly prime, because it can be changed into another prime (628303889) 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, 314181944 + 314181945.

It is an arithmetic number, because the mean of its divisors is an integer number (314181945).

Almost surely, 2^628363889 is an apocalyptic number.

It is an amenable number.

628363889 is a deficient number, since it is larger than the sum of its proper divisors (1).

628363889 is an equidigital number, since it uses as much as digits as its factorization.

628363889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2985984, while the sum is 53.

The square root of 628363889 is about 25067.1874968055. The cubic root of 628363889 is about 856.5191413934.

The spelling of 628363889 in words is "six hundred twenty-eight million, three hundred sixty-three thousand, eight hundred eighty-nine".