71721060 has 96 divisors (see below), whose sum is σ = 212405760. Its totient is φ = 18052608.

The previous prime is 71720959. The next prime is 71721071. The reversal of 71721060 is 6012717.

It is a self number, because there is not a number n which added to its sum of digits gives 71721060.

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, 81342 + ... + 82218.

It is an arithmetic number, because the mean of its divisors is an integer number (2212560).

Almost surely, 2^71721060 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 71721060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106202880).

71721060 is an abundant number, since it is smaller than the sum of its proper divisors (140684700).

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

71721060 is a wasteful number, since it uses less digits than its factorization.

71721060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965 (or 963 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 71721060 is about 8468.8287265713. The cubic root of 71721060 is about 415.4788299008.

Adding to 71721060 its reverse (6012717), we get a palindrome (77733777).

The spelling of 71721060 in words is "seventy-one million, seven hundred twenty-one thousand, sixty".