7939881647 has 8 divisors (see below), whose sum is σ = 7975690800. Its totient is φ = 7904096640.

The previous prime is 7939881643. The next prime is 7939881661. The reversal of 7939881647 is 7461889397.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7939881647 - 2² = 7939881643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7939881647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7939881641) 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, 1076729 + ... + 1084077.

It is an arithmetic number, because the mean of its divisors is an integer number (996961350).

Almost surely, 2^7939881647 is an apocalyptic number.

7939881647 is a deficient number, since it is larger than the sum of its proper divisors (35809153).

7939881647 is a wasteful number, since it uses less digits than its factorization.

7939881647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12073.

The product of its digits is 18289152, while the sum is 62.

The square root of 7939881647 is about 89106.0135288298. The cubic root of 7939881647 is about 1994.9775352315.

The spelling of 7939881647 in words is "seven billion, nine hundred thirty-nine million, eight hundred eighty-one thousand, six hundred forty-seven".