71921678720 has 32 divisors (see below), whose sum is σ = 171937764720. Its totient is φ = 28768671232.

The previous prime is 71921678669. The next prime is 71921678749. The reversal of 71921678720 is 2787612917.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56188172 + ... + 56189451.

Almost surely, 2^71921678720 is an apocalyptic number.

It is an amenable number.

71921678720 is an abundant number, since it is smaller than the sum of its proper divisors (100016086000).

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

71921678720 is a wasteful number, since it uses less digits than its factorization.

71921678720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112377642 (or 112377630 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 71921678720 in words is "seventy-one billion, nine hundred twenty-one million, six hundred seventy-eight thousand, seven hundred twenty".