71728842648 has 32 divisors (see below), whose sum is σ = 180509679360. Its totient is φ = 23751271200.

The previous prime is 71728842637. The next prime is 71728842649. The reversal of 71728842648 is 84624882717.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71728842649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9892740 + ... + 9899987.

It is an arithmetic number, because the mean of its divisors is an integer number (5640927480).

Almost surely, 2^71728842648 is an apocalyptic number.

It is an amenable number.

71728842648 is an abundant number, since it is smaller than the sum of its proper divisors (108780836712).

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

71728842648 is a wasteful number, since it uses less digits than its factorization.

71728842648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19792887 (or 19792883 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 57.

The spelling of 71728842648 in words is "seventy-one billion, seven hundred twenty-eight million, eight hundred forty-two thousand, six hundred forty-eight".