631686964 has 18 divisors (see below), whose sum is σ = 1124273094. Its totient is φ = 310472640.

The previous prime is 631686953. The next prime is 631687009. The reversal of 631686964 is 469686136.

631686964 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 3 ways, for example, as 278622864 + 353064100 = 16692^2 + 18790^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 391792 + ... + 393400.

Almost surely, 2^631686964 is an apocalyptic number.

It is an amenable number.

631686964 is a deficient number, since it is larger than the sum of its proper divisors (492586130).

631686964 is an equidigital number, since it uses as much as digits as its factorization.

631686964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283 (or 1672 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 631686964 is about 25133.3834570676. The cubic root of 631686964 is about 858.0263755582.

The spelling of 631686964 in words is "six hundred thirty-one million, six hundred eighty-six thousand, nine hundred sixty-four".