71981263992 has 32 divisors (see below), whose sum is σ = 196312538880. Its totient is φ = 21812504160.

The previous prime is 71981263973. The next prime is 71981264027. The reversal of 71981263992 is 29936218917.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 136327888 + ... + 136328415.

It is an arithmetic number, because the mean of its divisors is an integer number (6134766840).

Almost surely, 2^71981263992 is an apocalyptic number.

It is an amenable number.

71981263992 is an abundant number, since it is smaller than the sum of its proper divisors (124331274888).

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

71981263992 is a wasteful number, since it uses less digits than its factorization.

71981263992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272656323 (or 272656319 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 57.

The spelling of 71981263992 in words is "seventy-one billion, nine hundred eighty-one million, two hundred sixty-three thousand, nine hundred ninety-two".