7898558987 has 24 divisors (see below), whose sum is σ = 9042138000. Its totient is φ = 6885919040.

The previous prime is 7898558947. The next prime is 7898559029.

It is a happy number.

7898558987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7898558987 - 2⁶ = 7898558923 is a prime.

It is a super-2 number, since 2×7898558987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7898558947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 515288 + ... + 530394.

It is an arithmetic number, because the mean of its divisors is an integer number (376755750).

Almost surely, 2^7898558987 is an apocalyptic number.

7898558987 is a deficient number, since it is larger than the sum of its proper divisors (1143579013).

7898558987 is a wasteful number, since it uses less digits than its factorization.

7898558987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15307 (or 15296 counting only the distinct ones).

The product of its digits is 406425600, while the sum is 74.

The square root of 7898558987 is about 88873.8374720030. The cubic root of 7898558987 is about 1991.5105982650.

The spelling of 7898558987 in words is "seven billion, eight hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred eighty-seven".