7988008881 has 4 divisors (see below), whose sum is σ = 10650678512. Its totient is φ = 5325339252.

The previous prime is 7988008811. The next prime is 7988008981. The reversal of 7988008881 is 1888008897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7988008881 - 2¹⁴ = 7987992497 is a prime.

It is a super-2 number, since 2×7988008881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7988008811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331334811 + ... + 1331334816.

It is an arithmetic number, because the mean of its divisors is an integer number (2662669628).

Almost surely, 2^7988008881 is an apocalyptic number.

It is an amenable number.

7988008881 is a deficient number, since it is larger than the sum of its proper divisors (2662669631).

7988008881 is a wasteful number, since it uses less digits than its factorization.

7988008881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662669630.

The product of its (nonzero) digits is 2064384, while the sum is 57.

The square root of 7988008881 is about 89375.6615695794. The cubic root of 7988008881 is about 1999.0002404070. Note that the first 3 decimals are identical.

The spelling of 7988008881 in words is "seven billion, nine hundred eighty-eight million, eight thousand, eight hundred eighty-one".