7947864771 has 16 divisors (see below), whose sum is σ = 13212035328. Its totient is φ = 4128760800.

The previous prime is 7947864767. The next prime is 7947864779. The reversal of 7947864771 is 1774687497.

It is not a de Polignac number, because 7947864771 - 2² = 7947864767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7947864779) 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 15 ways as a sum of consecutive naturals, for example, 17202940 + ... + 17203401.

It is an arithmetic number, because the mean of its divisors is an integer number (825752208).

Almost surely, 2^7947864771 is an apocalyptic number.

7947864771 is a deficient number, since it is larger than the sum of its proper divisors (5264170557).

7947864771 is a wasteful number, since it uses less digits than its factorization.

7947864771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34406362.

The product of its digits is 16595712, while the sum is 60.

The square root of 7947864771 is about 89150.7979268834. The cubic root of 7947864771 is about 1995.6459254796.

The spelling of 7947864771 in words is "seven billion, nine hundred forty-seven million, eight hundred sixty-four thousand, seven hundred seventy-one".