630640668 has 24 divisors (see below), whose sum is σ = 1681708672. Its totient is φ = 180183024.

The previous prime is 630640663. The next prime is 630640669. The reversal of 630640668 is 866046036.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630640663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3753730 + ... + 3753897.

Almost surely, 2^630640668 is an apocalyptic number.

It is an amenable number.

630640668 is an abundant number, since it is smaller than the sum of its proper divisors (1051068004).

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

630640668 is a wasteful number, since it uses less digits than its factorization.

630640668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507641 (or 7507639 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 630640668 is about 25112.5599650852. The cubic root of 630640668 is about 857.5523825123.

The spelling of 630640668 in words is "six hundred thirty million, six hundred forty thousand, six hundred sixty-eight".