7987717872 has 30 divisors (see below), whose sum is σ = 22354516392. Its totient is φ = 2662572576.

The previous prime is 7987717861. The next prime is 7987717901. The reversal of 7987717872 is 2787177897.

It is a congruent number.

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, 27734988 + ... + 27735275.

Almost surely, 2^7987717872 is an apocalyptic number.

7987717872 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

7987717872 is an abundant number, since it is smaller than the sum of its proper divisors (14366798520).

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

7987717872 is a wasteful number, since it uses less digits than its factorization.

7987717872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55470277 (or 55470268 counting only the distinct ones).

The product of its digits is 19361664, while the sum is 63.

The square root of 7987717872 is about 89374.0335444250. The cubic root of 7987717872 is about 1998.9759650991.

The spelling of 7987717872 in words is "seven billion, nine hundred eighty-seven million, seven hundred seventeen thousand, eight hundred seventy-two".