631564616 has 8 divisors (see below), whose sum is σ = 1184183670. Its totient is φ = 315782304.

The previous prime is 631564601. The next prime is 631564651. The reversal of 631564616 is 616465136.

It can be written as a sum of positive squares in only one way, i.e., 513928900 + 117635716 = 22670^2 + 10846^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 631564616.

It is an unprimeable number.

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, 39472781 + ... + 39472796.

Almost surely, 2^631564616 is an apocalyptic number.

It is an amenable number.

631564616 is a deficient number, since it is larger than the sum of its proper divisors (552619054).

631564616 is a wasteful number, since it uses less digits than its factorization.

631564616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78945583 (or 78945579 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 631564616 is about 25130.9493652747. The cubic root of 631564616 is about 857.9709764997.

The spelling of 631564616 in words is "six hundred thirty-one million, five hundred sixty-four thousand, six hundred sixteen".