7878888787 has 16 divisors (see below), whose sum is σ = 10008375552. Its totient is φ = 6023553120.

The previous prime is 7878888781. The next prime is 7878888791.

7878888787 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 7878888787 - 2²⁷ = 7744671059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7878888781) 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, 961233 + ... + 969394.

It is an arithmetic number, because the mean of its divisors is an integer number (625523472).

Almost surely, 2^7878888787 is an apocalyptic number.

7878888787 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

7878888787 is a deficient number, since it is larger than the sum of its proper divisors (2129486765).

7878888787 is a wasteful number, since it uses less digits than its factorization.

7878888787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930698.

The product of its digits is 629407744, while the sum is 76.

The square root of 7878888787 is about 88763.1048747170. The cubic root of 7878888787 is about 1989.8560358973.

The spelling of 7878888787 in words is "seven billion, eight hundred seventy-eight million, eight hundred eighty-eight thousand, seven hundred eighty-seven".