671644318 has 16 divisors (see below), whose sum is σ = 1025406720. Its totient is φ = 329851800.

The previous prime is 671644307. The next prime is 671644327. The reversal of 671644318 is 813446176.

It is a super-2 number, since 2×671644318² = 902212179803370248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 250123 + ... + 252793.

It is an arithmetic number, because the mean of its divisors is an integer number (64087920).

Almost surely, 2^671644318 is an apocalyptic number.

671644318 is a deficient number, since it is larger than the sum of its proper divisors (353762402).

671644318 is a wasteful number, since it uses less digits than its factorization.

671644318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4863.

The product of its digits is 96768, while the sum is 40.

The square root of 671644318 is about 25916.1015200975. The cubic root of 671644318 is about 875.7492653749.

The spelling of 671644318 in words is "six hundred seventy-one million, six hundred forty-four thousand, three hundred eighteen".