671800005 has 24 divisors (see below), whose sum is σ = 1225741920. Its totient is φ = 339435360.

The previous prime is 671799991. The next prime is 671800007. The reversal of 671800005 is 500008176.

It is not a de Polignac number, because 671800005 - 2⁸ = 671799749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671800007) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 392011 + ... + 393720.

It is an arithmetic number, because the mean of its divisors is an integer number (51072580).

Almost surely, 2^671800005 is an apocalyptic number.

It is an amenable number.

671800005 is a deficient number, since it is larger than the sum of its proper divisors (553941915).

671800005 is a wasteful number, since it uses less digits than its factorization.

671800005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785761 (or 785758 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 671800005 is about 25919.1050192710. The cubic root of 671800005 is about 875.8169263074.

The spelling of 671800005 in words is "six hundred seventy-one million, eight hundred thousand, five".