71005720 has 64 divisors (see below), whose sum is σ = 164851200. Its totient is φ = 27511680.

The previous prime is 71005703. The next prime is 71005721. The reversal of 71005720 is 2750017.

It is a junction number, because it is equal to n+sod(n) for n = 71005691 and 71005700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71005721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336415 + ... + 336625.

It is an arithmetic number, because the mean of its divisors is an integer number (2575800).

Almost surely, 2^71005720 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 71005720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82425600).

71005720 is an abundant number, since it is smaller than the sum of its proper divisors (93845480).

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

71005720 is a wasteful number, since it uses less digits than its factorization.

71005720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 71005720 is about 8426.4891858947. The cubic root of 71005720 is about 414.0928945862.

Adding to 71005720 its reverse (2750017), we get a palindrome (73755737).

The spelling of 71005720 in words is "seventy-one million, five thousand, seven hundred twenty".