671917056 has 44 divisors (see below), whose sum is σ = 1790912112. Its totient is φ = 223971328.

The previous prime is 671917021. The next prime is 671917067. The reversal of 671917056 is 650719176.

It is a junction number, because it is equal to n+sod(n) for n = 671916999 and 671917017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106290 + ... + 112433.

It is an arithmetic number, because the mean of its divisors is an integer number (40702548).

Almost surely, 2^671917056 is an apocalyptic number.

It is an amenable number.

671917056 is an abundant number, since it is smaller than the sum of its proper divisors (1118995056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671917056 is a wasteful number, since it uses less digits than its factorization.

671917056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218746 (or 218728 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 671917056 is about 25921.3629271302. The cubic root of 671917056 is about 875.8677893087.

It can be divided in two parts, 67191 and 7056, that added together give a palindrome (74247).

The spelling of 671917056 in words is "six hundred seventy-one million, nine hundred seventeen thousand, fifty-six".