631403648 has 24 divisors (see below), whose sum is σ = 1258441065. Its totient is φ = 315559680.

The previous prime is 631403623. The next prime is 631403651. The reversal of 631403648 is 846304136.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 610682944 + 20720704 = 24712^2 + 4552^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=17768.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 283178 + ... + 285398.

Almost surely, 2^631403648 is an apocalyptic number.

It is an amenable number.

631403648 is a deficient number, since it is larger than the sum of its proper divisors (627037417).

631403648 is an frugal number, since it uses more digits than its factorization.

631403648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4456 (or 2223 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 631403648 is about 25127.7465762452. The cubic root of 631403648 is about 857.8980794419.

Multiplying 631403648 by its product of nonzero digits (41472), we get a square (26185572089856 = 5117184²).

The spelling of 631403648 in words is "six hundred thirty-one million, four hundred three thousand, six hundred forty-eight".