628463668 has 24 divisors (see below), whose sum is σ = 1258028352. Its totient is φ = 269105664.

The previous prime is 628463659. The next prime is 628463749. The reversal of 628463668 is 866364826.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24855 + ... + 43297.

It is an arithmetic number, because the mean of its divisors is an integer number (52417848).

Almost surely, 2^628463668 is an apocalyptic number.

It is an amenable number.

628463668 is an abundant number, since it is smaller than the sum of its proper divisors (629564684).

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

628463668 is a wasteful number, since it uses less digits than its factorization.

628463668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19671 (or 19669 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 49.

The square root of 628463668 is about 25069.1776490574. The cubic root of 628463668 is about 856.5644750510.

The spelling of 628463668 in words is "six hundred twenty-eight million, four hundred sixty-three thousand, six hundred sixty-eight".