71720616220 has 96 divisors (see below), whose sum is σ = 165784050432. Its totient is φ = 25846080000.

The previous prime is 71720616193. The next prime is 71720616239. The reversal of 71720616220 is 2261602717.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31441480 + ... + 31443760.

It is an arithmetic number, because the mean of its divisors is an integer number (1726917192).

Almost surely, 2^71720616220 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 71720616220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82892025216).

71720616220 is an abundant number, since it is smaller than the sum of its proper divisors (94063434212).

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

71720616220 is a wasteful number, since it uses less digits than its factorization.

71720616220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3523 (or 3521 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The spelling of 71720616220 in words is "seventy-one billion, seven hundred twenty million, six hundred sixteen thousand, two hundred twenty".