628666369 has 2 divisors, whose sum is σ = 628666370. Its totient is φ = 628666368.

The previous prime is 628666351. The next prime is 628666393. The reversal of 628666369 is 963666826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 618168769 + 10497600 = 24863^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 628666369 - 2¹¹ = 628664321 is a prime.

It is a super-2 number, since 2×628666369² = 790442807023288322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (628666309) 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, 314333184 + 314333185.

It is an arithmetic number, because the mean of its divisors is an integer number (314333185).

Almost surely, 2^628666369 is an apocalyptic number.

It is an amenable number.

628666369 is a deficient number, since it is larger than the sum of its proper divisors (1).

628666369 is an equidigital number, since it uses as much as digits as its factorization.

628666369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 52.

The square root of 628666369 is about 25073.2201561746. The cubic root of 628666369 is about 856.6565555859.

The spelling of 628666369 in words is "six hundred twenty-eight million, six hundred sixty-six thousand, three hundred sixty-nine".