628552709 has 2 divisors, whose sum is σ = 628552710. Its totient is φ = 628552708.

The previous prime is 628552693. The next prime is 628552733. The reversal of 628552709 is 907255826.

628552709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458902084 + 169650625 = 21422^2 + 13025^2 .

It is a cyclic number.

It is not a de Polignac number, because 628552709 - 2⁴ = 628552693 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 628552709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628552739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314276354 + 314276355.

It is an arithmetic number, because the mean of its divisors is an integer number (314276355).

Almost surely, 2^628552709 is an apocalyptic number.

It is an amenable number.

628552709 is a deficient number, since it is larger than the sum of its proper divisors (1).

628552709 is an equidigital number, since it uses as much as digits as its factorization.

628552709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 628552709 is about 25070.9534920393. The cubic root of 628552709 is about 856.6049259472.

The spelling of 628552709 in words is "six hundred twenty-eight million, five hundred fifty-two thousand, seven hundred nine".