7988699856 has 20 divisors (see below), whose sum is σ = 20637474752. Its totient is φ = 2662899936.

The previous prime is 7988699833. The next prime is 7988699863. The reversal of 7988699856 is 6589968897.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83215576 + ... + 83215671.

Almost surely, 2^7988699856 is an apocalyptic number.

It is an amenable number.

7988699856 is an abundant number, since it is smaller than the sum of its proper divisors (12648774896).

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

7988699856 is a wasteful number, since it uses less digits than its factorization.

7988699856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166431258 (or 166431252 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 75.

The square root of 7988699856 is about 89379.5270517807. The cubic root of 7988699856 is about 1999.0578776057.

The spelling of 7988699856 in words is "seven billion, nine hundred eighty-eight million, six hundred ninety-nine thousand, eight hundred fifty-six".