78938767971 has 24 divisors (see below), whose sum is σ = 135137976064. Its totient is φ = 45107866440.

The previous prime is 78938767951. The next prime is 78938767991. The reversal of 78938767971 is 17976783987.

It is an interprime number because it is at equal distance from previous prime (78938767951) and next prime (78938767991).

It is not a de Polignac number, because 78938767971 - 2⁹ = 78938767459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78938767971.

It is not an unprimeable number, because it can be changed into a prime (78938767951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23201935 + ... + 23205336.

Almost surely, 2^78938767971 is an apocalyptic number.

78938767971 is a deficient number, since it is larger than the sum of its proper divisors (56199208093).

78938767971 is an equidigital number, since it uses as much as digits as its factorization.

78938767971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46407293 (or 46407281 counting only the distinct ones).

The product of its digits is 224042112, while the sum is 72.

The spelling of 78938767971 in words is "seventy-eight billion, nine hundred thirty-eight million, seven hundred sixty-seven thousand, nine hundred seventy-one".