71868770856 has 80 divisors (see below), whose sum is σ = 202650376500. Its totient is φ = 23795444736.

The previous prime is 71868770821. The next prime is 71868770867. The reversal of 71868770856 is 65807786817.

It can be written as a sum of positive squares in 2 ways, for example, as 61389972900 + 10478797956 = 247770^2 + 102366^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71868770793 and 71868770802.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 275625 + ... + 468728.

Almost surely, 2^71868770856 is an apocalyptic number.

It is an amenable number.

71868770856 is an abundant number, since it is smaller than the sum of its proper divisors (130781605644).

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

71868770856 is a wasteful number, since it uses less digits than its factorization.

71868770856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744520 (or 744507 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

It can be divided in two parts, 71868 and 770856, that added together give a square (842724 = 918²).

The spelling of 71868770856 in words is "seventy-one billion, eight hundred sixty-eight million, seven hundred seventy thousand, eight hundred fifty-six".