628688899 has 2 divisors, whose sum is σ = 628688900. Its totient is φ = 628688898.

The previous prime is 628688869. The next prime is 628688903. The reversal of 628688899 is 998886826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628688899 - 2⁷ = 628688771 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628688899.

It is not a weakly prime, because it can be changed into another prime (628688869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314344449 + 314344450.

It is an arithmetic number, because the mean of its divisors is an integer number (314344450).

Almost surely, 2^628688899 is an apocalyptic number.

628688899 is a deficient number, since it is larger than the sum of its proper divisors (1).

628688899 is an equidigital number, since it uses as much as digits as its factorization.

628688899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23887872, while the sum is 64.

The square root of 628688899 is about 25073.6694362832. The cubic root of 628688899 is about 856.6667890169. Note that the first 3 decimals are identical.

The spelling of 628688899 in words is "six hundred twenty-eight million, six hundred eighty-eight thousand, eight hundred ninety-nine".