71991962672 has 40 divisors (see below), whose sum is σ = 162664068000. Its totient is φ = 30853695936.

The previous prime is 71991962657. The next prime is 71991962719. The reversal of 71991962672 is 27626919917.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6553547 + ... + 6564522.

It is an arithmetic number, because the mean of its divisors is an integer number (4066601700).

Almost surely, 2^71991962672 is an apocalyptic number.

It is an amenable number.

71991962672 is an abundant number, since it is smaller than the sum of its proper divisors (90672105328).

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

71991962672 is a wasteful number, since it uses less digits than its factorization.

71991962672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13118098 (or 13118078 counting only the distinct ones).

The product of its digits is 5143824, while the sum is 59.

The spelling of 71991962672 in words is "seventy-one billion, nine hundred ninety-one million, nine hundred sixty-two thousand, six hundred seventy-two".