71247064836 has 24 divisors (see below), whose sum is σ = 166599145440. Its totient is φ = 23698165312.

The previous prime is 71247064807. The next prime is 71247064883. The reversal of 71247064836 is 63846074217.

It is a happy number.

It is a super-2 number, since 2×71247064836² (a number of 23 digits) contains 22 as substring.

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, 6351201 + ... + 6362408.

It is an arithmetic number, because the mean of its divisors is an integer number (6941631060).

Almost surely, 2^71247064836 is an apocalyptic number.

It is an amenable number.

71247064836 is an abundant number, since it is smaller than the sum of its proper divisors (95352080604).

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

71247064836 is a wasteful number, since it uses less digits than its factorization.

71247064836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12714083 (or 12714081 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 48.

The spelling of 71247064836 in words is "seventy-one billion, two hundred forty-seven million, sixty-four thousand, eight hundred thirty-six".