630778788 has 18 divisors (see below), whose sum is σ = 1594468694. Its totient is φ = 210259584.

The previous prime is 630778783. The next prime is 630778789. The reversal of 630778788 is 887877036.

630778788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 608707584 + 22071204 = 24672^2 + 4698^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (630778781) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8760781 + ... + 8760852.

Almost surely, 2^630778788 is an apocalyptic number.

It is an amenable number.

630778788 is an abundant number, since it is smaller than the sum of its proper divisors (963689906).

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

630778788 is a wasteful number, since it uses less digits than its factorization.

630778788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17521643 (or 17521638 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The square root of 630778788 is about 25115.3098328490. The cubic root of 630778788 is about 857.6149836601.

The spelling of 630778788 in words is "six hundred thirty million, seven hundred seventy-eight thousand, seven hundred eighty-eight".