628079869 has 2 divisors, whose sum is σ = 628079870. Its totient is φ = 628079868.

The previous prime is 628079833. The next prime is 628079873. The reversal of 628079869 is 968970826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413105625 + 214974244 = 20325^2 + 14662^2 .

It is a cyclic number.

It is not a de Polignac number, because 628079869 - 2⁷ = 628079741 is a prime.

It is a super-2 number, since 2×628079869² = 788968643686114322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628079899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314039934 + 314039935.

It is an arithmetic number, because the mean of its divisors is an integer number (314039935).

Almost surely, 2^628079869 is an apocalyptic number.

It is an amenable number.

628079869 is a deficient number, since it is larger than the sum of its proper divisors (1).

628079869 is an equidigital number, since it uses as much as digits as its factorization.

628079869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 628079869 is about 25061.5216816537. The cubic root of 628079869 is about 856.3900732783.

The spelling of 628079869 in words is "six hundred twenty-eight million, seventy-nine thousand, eight hundred sixty-nine".