71781868268 has 48 divisors (see below), whose sum is σ = 137868200064. Its totient is φ = 32430963840.

The previous prime is 71781868253. The next prime is 71781868313. The reversal of 71781868268 is 86286818717.

It is a super-2 number, since 2×71781868268² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71781868268.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6416696 + ... + 6427872.

It is an arithmetic number, because the mean of its divisors is an integer number (2872254168).

Almost surely, 2^71781868268 is an apocalyptic number.

It is an amenable number.

71781868268 is a deficient number, since it is larger than the sum of its proper divisors (66086331796).

71781868268 is a wasteful number, since it uses less digits than its factorization.

71781868268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12062 (or 12060 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 62.

It can be divided in two parts, 71781 and 868268, that added together give a palindrome (940049).

The spelling of 71781868268 in words is "seventy-one billion, seven hundred eighty-one million, eight hundred sixty-eight thousand, two hundred sixty-eight".