71989329812 has 12 divisors (see below), whose sum is σ = 126228838260. Its totient is φ = 35923947456.

The previous prime is 71989329799. The next prime is 71989329827. The reversal of 71989329812 is 21892398917.

It can be written as a sum of positive squares in 2 ways, for example, as 57123868036 + 14865461776 = 239006^2 + 121924^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17677073 + ... + 17681144.

It is an arithmetic number, because the mean of its divisors is an integer number (10519069855).

Almost surely, 2^71989329812 is an apocalyptic number.

It is an amenable number.

71989329812 is a deficient number, since it is larger than the sum of its proper divisors (54239508448).

71989329812 is a wasteful number, since it uses less digits than its factorization.

71989329812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35358730 (or 35358728 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 59.

The spelling of 71989329812 in words is "seventy-one billion, nine hundred eighty-nine million, three hundred twenty-nine thousand, eight hundred twelve".