628669819 has 2 divisors, whose sum is σ = 628669820. Its totient is φ = 628669818.

The previous prime is 628669813. The next prime is 628669823. The reversal of 628669819 is 918966826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628669819 - 2¹⁷ = 628538747 is a prime.

It is a super-2 number, since 2×628669819² = 790451482642985522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 628669819.

It is not a weakly prime, because it can be changed into another prime (628669813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314334909 + 314334910.

It is an arithmetic number, because the mean of its divisors is an integer number (314334910).

Almost surely, 2^628669819 is an apocalyptic number.

628669819 is a deficient number, since it is larger than the sum of its proper divisors (1).

628669819 is an equidigital number, since it uses as much as digits as its factorization.

628669819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 55.

The square root of 628669819 is about 25073.2889545827. The cubic root of 628669819 is about 856.6581226385.

The spelling of 628669819 in words is "six hundred twenty-eight million, six hundred sixty-nine thousand, eight hundred nineteen".