7878668787 has 12 divisors (see below), whose sum is σ = 12414872184. Its totient is φ = 4774950720.

The previous prime is 7878668783. The next prime is 7878668789.

7878668787 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7878668787 - 2² = 7878668783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7878668783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39791158 + ... + 39791355.

It is an arithmetic number, because the mean of its divisors is an integer number (1034572682).

Almost surely, 2^7878668787 is an apocalyptic number.

7878668787 is a deficient number, since it is larger than the sum of its proper divisors (4536203397).

7878668787 is a wasteful number, since it uses less digits than its factorization.

7878668787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79582530 (or 79582527 counting only the distinct ones).

The product of its digits is 354041856, while the sum is 72.

The square root of 7878668787 is about 88761.8656124352. The cubic root of 7878668787 is about 1989.8375149944.

The spelling of 7878668787 in words is "seven billion, eight hundred seventy-eight million, six hundred sixty-eight thousand, seven hundred eighty-seven".