628789111 has 8 divisors (see below), whose sum is σ = 658272384. Its totient is φ = 599484600.

The previous prime is 628789099. The next prime is 628789121. The reversal of 628789111 is 111987826.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628789111 - 2⁹ = 628788599 is a prime.

It is a super-2 number, since 2×628789111² = 790751492224340642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628789121) 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 in 7 ways as a sum of consecutive naturals, for example, 37465 + ... + 51586.

It is an arithmetic number, because the mean of its divisors is an integer number (82284048).

Almost surely, 2^628789111 is an apocalyptic number.

628789111 is a deficient number, since it is larger than the sum of its proper divisors (29483273).

628789111 is a wasteful number, since it uses less digits than its factorization.

628789111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89381.

The product of its digits is 48384, while the sum is 43.

The square root of 628789111 is about 25075.6677079594. The cubic root of 628789111 is about 856.7123037017.

The spelling of 628789111 in words is "six hundred twenty-eight million, seven hundred eighty-nine thousand, one hundred eleven".