71878087816 has 16 divisors (see below), whose sum is σ = 134783150940. Its totient is φ = 35935914240.

The previous prime is 71878087811. The next prime is 71878087817. The reversal of 71878087816 is 61878087817.

It can be written as a sum of positive squares in 2 ways, for example, as 66021246916 + 5856840900 = 256946^2 + 76530^2 .

It is not an unprimeable number, because it can be changed into a prime (71878087811) 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 3 ways as a sum of consecutive naturals, for example, 292125 + ... + 478636.

Almost surely, 2^71878087816 is an apocalyptic number.

It is an amenable number.

71878087816 is a deficient number, since it is larger than the sum of its proper divisors (62905063124).

71878087816 is a wasteful number, since it uses less digits than its factorization.

71878087816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782424 (or 782420 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 61.

Subtracting from 71878087816 its reverse (61878087817), we obtain a palindrome (9999999999).

The spelling of 71878087816 in words is "seventy-one billion, eight hundred seventy-eight million, eighty-seven thousand, eight hundred sixteen".