7897887987 has 16 divisors (see below), whose sum is σ = 11529322752. Its totient is φ = 4769313120.

The previous prime is 7897887979. The next prime is 7897888001.

7897887987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7897887987 - 2³ = 7897887979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7897887917) 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 15 ways as a sum of consecutive naturals, for example, 422863 + ... + 441144.

It is an arithmetic number, because the mean of its divisors is an integer number (720582672).

Almost surely, 2^7897887987 is an apocalyptic number.

7897887987 is a deficient number, since it is larger than the sum of its proper divisors (3631434765).

7897887987 is a wasteful number, since it uses less digits than its factorization.

7897887987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864298.

The product of its digits is 796594176, while the sum is 78.

The square root of 7897887987 is about 88870.0623776084. The cubic root of 7897887987 is about 1991.4542022626.

The spelling of 7897887987 in words is "seven billion, eight hundred ninety-seven million, eight hundred eighty-seven thousand, nine hundred eighty-seven".