628558685 has 4 divisors (see below), whose sum is σ = 754270428. Its totient is φ = 502846944.

The previous prime is 628558639. The next prime is 628558709. The reversal of 628558685 is 586855826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586855826 = 2 ⋅293427913.

It can be written as a sum of positive squares in 2 ways, for example, as 333646756 + 294911929 = 18266^2 + 17173^2 .

It is a cyclic number.

It is not a de Polignac number, because 628558685 - 2⁶ = 628558621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62855864 + ... + 62855873.

It is an arithmetic number, because the mean of its divisors is an integer number (188567607).

Almost surely, 2^628558685 is an apocalyptic number.

It is an amenable number.

628558685 is a deficient number, since it is larger than the sum of its proper divisors (125711743).

628558685 is a wasteful number, since it uses less digits than its factorization.

628558685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125711742.

The product of its digits is 4608000, while the sum is 53.

The square root of 628558685 is about 25071.0726735016. The cubic root of 628558685 is about 856.6076406783.

The spelling of 628558685 in words is "six hundred twenty-eight million, five hundred fifty-eight thousand, six hundred eighty-five".