628686844 has 24 divisors (see below), whose sum is σ = 1108915920. Its totient is φ = 311862144.

The previous prime is 628686829. The next prime is 628686847. The reversal of 628686844 is 448686826.

It is a junction number, because it is equal to n+sod(n) for n = 628686791 and 628686800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628686847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559267 + ... + 560389.

It is an arithmetic number, because the mean of its divisors is an integer number (46204830).

Almost surely, 2^628686844 is an apocalyptic number.

It is an amenable number.

628686844 is a deficient number, since it is larger than the sum of its proper divisors (480229076).

628686844 is a wasteful number, since it uses less digits than its factorization.

628686844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 2107 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 52.

The square root of 628686844 is about 25073.6284570064. The cubic root of 628686844 is about 856.6658556182.

The spelling of 628686844 in words is "six hundred twenty-eight million, six hundred eighty-six thousand, eight hundred forty-four".