628135989 has 24 divisors (see below), whose sum is σ = 909214272. Its totient is φ = 385557120.

The previous prime is 628135979. The next prime is 628135999. The reversal of 628135989 is 989531826.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (628135979) and next prime (628135999).

It is not a de Polignac number, because 628135989 - 2⁹ = 628135477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628135909) 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 23 ways as a sum of consecutive naturals, for example, 230344 + ... + 233054.

It is an arithmetic number, because the mean of its divisors is an integer number (37883928).

Almost surely, 2^628135989 is an apocalyptic number.

It is an amenable number.

628135989 is a deficient number, since it is larger than the sum of its proper divisors (281078283).

628135989 is a wasteful number, since it uses less digits than its factorization.

628135989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197 (or 3184 counting only the distinct ones).

The product of its digits is 933120, while the sum is 51.

The square root of 628135989 is about 25062.6413013473. The cubic root of 628135989 is about 856.4155791532.

The spelling of 628135989 in words is "six hundred twenty-eight million, one hundred thirty-five thousand, nine hundred eighty-nine".