671987865600 has 432 divisors, whose sum is σ = 2533319497800. Its totient is φ = 169763143680.

The previous prime is 671987865599. The next prime is 671987865607. The reversal of 671987865600 is 6568789176.

671987865600 is a `hidden beast` number, since 6 + 7 + 19 + 8 + 7 + 8 + 6 + 5 + 600 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671987865607) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8716824 + ... + 8793576.

Almost surely, 2^671987865600 is an apocalyptic number.

671987865600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671987865600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266659748900).

671987865600 is an abundant number, since it is smaller than the sum of its proper divisors (1861331632200).

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

671987865600 is a wasteful number, since it uses less digits than its factorization.

671987865600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76810 (or 76782 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 671987865600 in words is "six hundred seventy-one billion, nine hundred eighty-seven million, eight hundred sixty-five thousand, six hundred".