78127707931 has 24 divisors (see below), whose sum is σ = 99335135760. Its totient is φ = 60892679232.

The previous prime is 78127707929. The next prime is 78127707971. The reversal of 78127707931 is 13970772187.

It is a happy number.

It is not a de Polignac number, because 78127707931 - 2¹ = 78127707929 is a prime.

It is a super-2 number, since 2×78127707931² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78127707971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 872616 + ... + 957973.

It is an arithmetic number, because the mean of its divisors is an integer number (4138963990).

Almost surely, 2^78127707931 is an apocalyptic number.

78127707931 is a deficient number, since it is larger than the sum of its proper divisors (21207427829).

78127707931 is a wasteful number, since it uses less digits than its factorization.

78127707931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830683 (or 1830676 counting only the distinct ones).

The product of its (nonzero) digits is 1037232, while the sum is 52.

The spelling of 78127707931 in words is "seventy-eight billion, one hundred twenty-seven million, seven hundred seven thousand, nine hundred thirty-one".