631316864 has 16 divisors (see below), whose sum is σ = 1257701820. Its totient is φ = 315658368.

The previous prime is 631316839. The next prime is 631316869. The reversal of 631316864 is 468613136.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631316869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2465954 + ... + 2466209.

Almost surely, 2^631316864 is an apocalyptic number.

631316864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

631316864 is a deficient number, since it is larger than the sum of its proper divisors (626384956).

631316864 is an equidigital number, since it uses as much as digits as its factorization.

631316864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932177 (or 4932165 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 631316864 is about 25126.0196609013. The cubic root of 631316864 is about 857.8587727119.

The spelling of 631316864 in words is "six hundred thirty-one million, three hundred sixteen thousand, eight hundred sixty-four".