671286987140 has 432 divisors, whose sum is σ = 1929809452032. Its totient is φ = 191771712000.

The previous prime is 671286987131. The next prime is 671286987143. The reversal of 671286987140 is 41789682176.

It is a self number, because there is not a number n which added to its sum of digits gives 671286987140.

It is not an unprimeable number, because it can be changed into a prime (671286987143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 189573770 + ... + 189577310.

Almost surely, 2^671286987140 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 671286987140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964904726016).

671286987140 is an abundant number, since it is smaller than the sum of its proper divisors (1258522464892).

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

671286987140 is a wasteful number, since it uses less digits than its factorization.

671286987140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648 (or 3616 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 59.

The spelling of 671286987140 in words is "six hundred seventy-one billion, two hundred eighty-six million, nine hundred eighty-seven thousand, one hundred forty".