671567616 has 324 divisors, whose sum is σ = 2204147400. Its totient is φ = 195858432.

The previous prime is 671567591. The next prime is 671567653. The reversal of 671567616 is 616765176.

671567616 is a `hidden beast` number, since 6 + 71 + 567 + 6 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23157490 + ... + 23157518.

Almost surely, 2^671567616 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 671567616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102073700).

671567616 is an abundant number, since it is smaller than the sum of its proper divisors (1532579784).

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

671567616 is a wasteful number, since it uses less digits than its factorization.

671567616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 76 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 671567616 is about 25914.6216642265. The cubic root of 671567616 is about 875.7159271553.

The spelling of 671567616 in words is "six hundred seventy-one million, five hundred sixty-seven thousand, six hundred sixteen".