71991946432 has 28 divisors (see below), whose sum is σ = 163267450960. Its totient is φ = 30853691136.

The previous prime is 71991946417. The next prime is 71991946441. The reversal of 71991946432 is 23464919917.

It is a tau number, because it is divible by the number of its divisors (28).

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, 80347707 + ... + 80348602.

Almost surely, 2^71991946432 is an apocalyptic number.

It is an amenable number.

71991946432 is an abundant number, since it is smaller than the sum of its proper divisors (91275504528).

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

71991946432 is a wasteful number, since it uses less digits than its factorization.

71991946432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160696328 (or 160696318 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 55.

The spelling of 71991946432 in words is "seventy-one billion, nine hundred ninety-one million, nine hundred forty-six thousand, four hundred thirty-two".