671081072720 has 80 divisors (see below), whose sum is σ = 1565391653760. Its totient is φ = 267551424000.

The previous prime is 671081072699. The next prime is 671081072777. The reversal of 671081072720 is 27270180176.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 36902030 + ... + 36920210.

It is an arithmetic number, because the mean of its divisors is an integer number (19567395672).

Almost surely, 2^671081072720 is an apocalyptic number.

It is an amenable number.

671081072720 is an abundant number, since it is smaller than the sum of its proper divisors (894310581040).

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

671081072720 is a wasteful number, since it uses less digits than its factorization.

671081072720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19684 (or 19678 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 41.

The spelling of 671081072720 in words is "six hundred seventy-one billion, eighty-one million, seventy-two thousand, seven hundred twenty".