71720927232 has 128 divisors (see below), whose sum is σ = 199574521920. Its totient is φ = 22866821120.

The previous prime is 71720927227. The next prime is 71720927233. The reversal of 71720927232 is 23272902717.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (71720927233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245132 + ... + 2276852.

Almost surely, 2^71720927232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71720927232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99787260960).

71720927232 is an abundant number, since it is smaller than the sum of its proper divisors (127853594688).

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

71720927232 is an equidigital number, since it uses as much as digits as its factorization.

71720927232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31777 (or 31749 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 71720927232 in words is "seventy-one billion, seven hundred twenty million, nine hundred twenty-seven thousand, two hundred thirty-two".