628689539 has 2 divisors, whose sum is σ = 628689540. Its totient is φ = 628689538.

The previous prime is 628689493. The next prime is 628689547. The reversal of 628689539 is 935986826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628689539 - 2²⁰ = 627640963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (628689599) 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 as a sum of consecutive naturals, namely, 314344769 + 314344770.

It is an arithmetic number, because the mean of its divisors is an integer number (314344770).

Almost surely, 2^628689539 is an apocalyptic number.

628689539 is a deficient number, since it is larger than the sum of its proper divisors (1).

628689539 is an equidigital number, since it uses as much as digits as its factorization.

628689539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The square root of 628689539 is about 25073.6821986720. The cubic root of 628689539 is about 856.6670797100.

The spelling of 628689539 in words is "six hundred twenty-eight million, six hundred eighty-nine thousand, five hundred thirty-nine".