628128129 has 4 divisors (see below), whose sum is σ = 837504176. Its totient is φ = 418752084.

The previous prime is 628128119. The next prime is 628128167. The reversal of 628128129 is 921821826.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 628128129 - 2⁴ = 628128113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628128119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104688019 + ... + 104688024.

It is an arithmetic number, because the mean of its divisors is an integer number (209376044).

Almost surely, 2^628128129 is an apocalyptic number.

It is an amenable number.

628128129 is a deficient number, since it is larger than the sum of its proper divisors (209376047).

628128129 is a wasteful number, since it uses less digits than its factorization.

628128129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209376046.

The product of its digits is 27648, while the sum is 39.

The square root of 628128129 is about 25062.4844937608. The cubic root of 628128129 is about 856.4120069678.

The spelling of 628128129 in words is "six hundred twenty-eight million, one hundred twenty-eight thousand, one hundred twenty-nine".