628780668 has 24 divisors (see below), whose sum is σ = 1517747280. Its totient is φ = 202366080.

The previous prime is 628780667. The next prime is 628780681. The reversal of 628780668 is 866087826.

It is a self number, because there is not a number n which added to its sum of digits gives 628780668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628780667) 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, 903073 + ... + 903768.

It is an arithmetic number, because the mean of its divisors is an integer number (63239470).

Almost surely, 2^628780668 is an apocalyptic number.

It is an amenable number.

628780668 is an abundant number, since it is smaller than the sum of its proper divisors (888966612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

628780668 is a wasteful number, since it uses less digits than its factorization.

628780668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806877 (or 1806875 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 628780668 is about 25075.4993569420. The cubic root of 628780668 is about 856.7084692130.

The spelling of 628780668 in words is "six hundred twenty-eight million, seven hundred eighty thousand, six hundred sixty-eight".