7987771888 has 20 divisors (see below), whose sum is σ = 15488918368. Its totient is φ = 3990631680.

The previous prime is 7987771879. The next prime is 7987771889. The reversal of 7987771888 is 8881777897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987771889) 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 3 ways as a sum of consecutive naturals, for example, 183081 + ... + 222472.

Almost surely, 2^7987771888 is an apocalyptic number.

It is an amenable number.

7987771888 is a deficient number, since it is larger than the sum of its proper divisors (7501146480).

7987771888 is a wasteful number, since it uses less digits than its factorization.

7987771888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406792 (or 406786 counting only the distinct ones).

The product of its digits is 88510464, while the sum is 70.

The square root of 7987771888 is about 89374.3357345944. The cubic root of 7987771888 is about 1998.9804710353.

The spelling of 7987771888 in words is "seven billion, nine hundred eighty-seven million, seven hundred seventy-one thousand, eight hundred eighty-eight".