71989443728 has 20 divisors (see below), whose sum is σ = 139676296380. Its totient is φ = 35943947904.

The previous prime is 71989443709. The next prime is 71989443787. The reversal of 71989443728 is 82734498917.

It can be written as a sum of positive squares in 2 ways, for example, as 48449292544 + 23540151184 = 220112^2 + 153428^2 .

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 3 ways as a sum of consecutive naturals, for example, 3161675 + ... + 3184362.

It is an arithmetic number, because the mean of its divisors is an integer number (6983814819).

Almost surely, 2^71989443728 is an apocalyptic number.

It is an amenable number.

71989443728 is a deficient number, since it is larger than the sum of its proper divisors (67686852652).

71989443728 is a wasteful number, since it uses less digits than its factorization.

71989443728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6346754 (or 6346748 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 62.

The spelling of 71989443728 in words is "seventy-one billion, nine hundred eighty-nine million, four hundred forty-three thousand, seven hundred twenty-eight".