7988778896 has 30 divisors (see below), whose sum is σ = 18005323590. Its totient is φ = 3423762048.

The previous prime is 7988778851. The next prime is 7988778911. The reversal of 7988778896 is 6988778897.

It can be written as a sum of positive squares in only one way, i.e., 5348874496 + 2639904400 = 73136^2 + 51380^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5094101 + ... + 5095668.

It is an arithmetic number, because the mean of its divisors is an integer number (600177453).

Almost surely, 2^7988778896 is an apocalyptic number.

It is an amenable number.

7988778896 is an abundant number, since it is smaller than the sum of its proper divisors (10016544694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7988778896 is a wasteful number, since it uses less digits than its factorization.

7988778896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10189791 (or 10189778 counting only the distinct ones).

The product of its digits is 682795008, while the sum is 77.

The square root of 7988778896 is about 89379.9692101088. The cubic root of 7988778896 is about 1999.0644704605.

Subtracting from 7988778896 its reverse (6988778897), we obtain a palindrome (999999999).

The spelling of 7988778896 in words is "seven billion, nine hundred eighty-eight million, seven hundred seventy-eight thousand, eight hundred ninety-six".