71009721472 has 32 divisors (see below), whose sum is σ = 141485841180. Its totient is φ = 35499549696.

The previous prime is 71009721437. The next prime is 71009721473. The reversal of 71009721472 is 27412790017.

It can be written as a sum of positive squares in 2 ways, for example, as 63855268416 + 7154453056 = 252696^2 + 84584^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (71009721473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900798 + ... + 976450.

Almost surely, 2^71009721472 is an apocalyptic number.

It is an amenable number.

71009721472 is a deficient number, since it is larger than the sum of its proper divisors (70476119708).

71009721472 is an equidigital number, since it uses as much as digits as its factorization.

71009721472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83000 (or 82988 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 71009721472 in words is "seventy-one billion, nine million, seven hundred twenty-one thousand, four hundred seventy-two".