671161216 has 64 divisors (see below), whose sum is σ = 1467331200. Its totient is φ = 303255040.

The previous prime is 671161201. The next prime is 671161237. The reversal of 671161216 is 612161176.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250701 + ... + 253363.

It is an arithmetic number, because the mean of its divisors is an integer number (22927050).

Almost surely, 2^671161216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671161216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (733665600).

671161216 is an abundant number, since it is smaller than the sum of its proper divisors (796169984).

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

671161216 is a wasteful number, since it uses less digits than its factorization.

671161216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2867 (or 2855 counting only the distinct ones).

The product of its digits is 3024, while the sum is 31.

The square root of 671161216 is about 25906.7793444110. The cubic root of 671161216 is about 875.5392446403.

The spelling of 671161216 in words is "six hundred seventy-one million, one hundred sixty-one thousand, two hundred sixteen".