7998481687 has 4 divisors (see below), whose sum is σ = 9141121936. Its totient is φ = 6855841440.

The previous prime is 7998481681. The next prime is 7998481703. The reversal of 7998481687 is 7861848997.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7998481687 - 2¹¹ = 7998479639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7998481681) 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, 571320114 + ... + 571320127.

It is an arithmetic number, because the mean of its divisors is an integer number (2285280484).

Almost surely, 2^7998481687 is an apocalyptic number.

7998481687 is a deficient number, since it is larger than the sum of its proper divisors (1142640249).

7998481687 is a wasteful number, since it uses less digits than its factorization.

7998481687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142640248.

The product of its digits is 48771072, while the sum is 67.

The square root of 7998481687 is about 89434.2310695407. The cubic root of 7998481687 is about 1999.8734659114.

The spelling of 7998481687 in words is "seven billion, nine hundred ninety-eight million, four hundred eighty-one thousand, six hundred eighty-seven".