628824869 has 2 divisors, whose sum is σ = 628824870. Its totient is φ = 628824868.

The previous prime is 628824803. The next prime is 628824871. The reversal of 628824869 is 968428826.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 333500644 + 295324225 = 18262^2 + 17185^2 .

It is a cyclic number.

It is not a de Polignac number, because 628824869 - 2¹⁶ = 628759333 is a prime.

It is a super-2 number, since 2×628824869² = 790841431745734322, which contains 22 as substring.

Together with 628824871, it forms a pair of twin primes.

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 628824869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628824269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314412434 + 314412435.

It is an arithmetic number, because the mean of its divisors is an integer number (314412435).

Almost surely, 2^628824869 is an apocalyptic number.

It is an amenable number.

628824869 is a deficient number, since it is larger than the sum of its proper divisors (1).

628824869 is an equidigital number, since it uses as much as digits as its factorization.

628824869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2654208, while the sum is 53.

The square root of 628824869 is about 25076.3806997740. The cubic root of 628824869 is about 856.7285432418.

The spelling of 628824869 in words is "six hundred twenty-eight million, eight hundred twenty-four thousand, eight hundred sixty-nine".