630399944 has 8 divisors (see below), whose sum is σ = 1181999910. Its totient is φ = 315199968.

The previous prime is 630399943. The next prime is 630399947. The reversal of 630399944 is 449993036.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 527620900 + 102779044 = 22970^2 + 10138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (630399943) 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 as a sum of consecutive naturals, namely, 39399989 + ... + 39400004.

Almost surely, 2^630399944 is an apocalyptic number.

It is an amenable number.

630399944 is a deficient number, since it is larger than the sum of its proper divisors (551599966).

630399944 is a wasteful number, since it uses less digits than its factorization.

630399944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78799999 (or 78799995 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 47.

The square root of 630399944 is about 25107.7666071676. The cubic root of 630399944 is about 857.4432555446.

The spelling of 630399944 in words is "six hundred thirty million, three hundred ninety-nine thousand, nine hundred forty-four".