631680805 has 16 divisors (see below), whose sum is σ = 883987200. Its totient is φ = 433151376.

The previous prime is 631680779. The next prime is 631680811. The reversal of 631680805 is 508086136.

It is not a de Polignac number, because 631680805 - 2⁵ = 631680773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182449 + ... + 185878.

It is an arithmetic number, because the mean of its divisors is an integer number (55249200).

Almost surely, 2^631680805 is an apocalyptic number.

It is an amenable number.

631680805 is a deficient number, since it is larger than the sum of its proper divisors (252306395).

631680805 is an equidigital number, since it uses as much as digits as its factorization.

631680805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368353 (or 368339 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 631680805 is about 25133.2609304881. The cubic root of 631680805 is about 858.0235869398.

The spelling of 631680805 in words is "six hundred thirty-one million, six hundred eighty thousand, eight hundred five".