78836171728 has 20 divisors (see below), whose sum is σ = 156873329380. Its totient is φ = 38352731904.

The previous prime is 78836171669. The next prime is 78836171753. The reversal of 78836171728 is 82717163887.

It can be written as a sum of positive squares in 2 ways, for example, as 43367229504 + 35468942224 = 208248^2 + 188332^2 .

It is a congruent number.

It is an unprimeable number.

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, 66584013 + ... + 66585196.

It is an arithmetic number, because the mean of its divisors is an integer number (7843666469).

Almost surely, 2^78836171728 is an apocalyptic number.

It is an amenable number.

78836171728 is a deficient number, since it is larger than the sum of its proper divisors (78037157652).

78836171728 is a wasteful number, since it uses less digits than its factorization.

78836171728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133169254 (or 133169248 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 58.

The spelling of 78836171728 in words is "seventy-eight billion, eight hundred thirty-six million, one hundred seventy-one thousand, seven hundred twenty-eight".