71000006520 has 32 divisors (see below), whose sum is σ = 213000019920. Its totient is φ = 18933335040.

The previous prime is 71000006509. The next prime is 71000006611. The reversal of 71000006520 is 2560000017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295833241 + ... + 295833480.

Almost surely, 2^71000006520 is an apocalyptic number.

It is an amenable number.

71000006520 is an abundant number, since it is smaller than the sum of its proper divisors (142000013400).

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

71000006520 is a wasteful number, since it uses less digits than its factorization.

71000006520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591666735 (or 591666731 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

Adding to 71000006520 its reverse (2560000017), we get a palindrome (73560006537).

The spelling of 71000006520 in words is "seventy-one billion, six thousand, five hundred twenty".