7988778897 has 8 divisors (see below), whose sum is σ = 11620042080. Its totient is φ = 4841684160.

The previous prime is 7988778851. The next prime is 7988778911.

7988778897 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 7988778897 - 2⁷ = 7988778769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7988778827) 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 7 ways as a sum of consecutive naturals, for example, 121042072 + ... + 121042137.

It is an arithmetic number, because the mean of its divisors is an integer number (1452505260).

Almost surely, 2^7988778897 is an apocalyptic number.

It is an amenable number.

7988778897 is a deficient number, since it is larger than the sum of its proper divisors (3631263183).

7988778897 is a wasteful number, since it uses less digits than its factorization.

7988778897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242084223.

The product of its digits is 796594176, while the sum is 78.

The square root of 7988778897 is about 89379.9692157029. The cubic root of 7988778897 is about 1999.0644705439.

It can be divided in two parts, 7988 and 778897, that added together give a triangular number (786885 = T₁₂₅₄).

The spelling of 7988778897 in words is "seven billion, nine hundred eighty-eight million, seven hundred seventy-eight thousand, eight hundred ninety-seven".