628863889 has 2 divisors, whose sum is σ = 628863890. Its totient is φ = 628863888.

The previous prime is 628863853. The next prime is 628863899. The reversal of 628863889 is 988368826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497646864 + 131217025 = 22308^2 + 11455^2 .

It is a cyclic number.

It is not a de Polignac number, because 628863889 - 2⁷ = 628863761 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628863899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314431944 + 314431945.

It is an arithmetic number, because the mean of its divisors is an integer number (314431945).

Almost surely, 2^628863889 is an apocalyptic number.

It is an amenable number.

628863889 is a deficient number, since it is larger than the sum of its proper divisors (1).

628863889 is an equidigital number, since it uses as much as digits as its factorization.

628863889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7962624, while the sum is 58.

The square root of 628863889 is about 25077.1587106674. The cubic root of 628863889 is about 856.7462635208.

The spelling of 628863889 in words is "six hundred twenty-eight million, eight hundred sixty-three thousand, eight hundred eighty-nine".