7987789797 has 16 divisors (see below), whose sum is σ = 11476116288. Its totient is φ = 4912790400.

The previous prime is 7987789763. The next prime is 7987789811. The reversal of 7987789797 is 7979877897.

It is not a de Polignac number, because 7987789797 - 2²² = 7983595493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987789717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13378 + ... + 127100.

It is an arithmetic number, because the mean of its divisors is an integer number (717257268).

Almost surely, 2^7987789797 is an apocalyptic number.

It is an amenable number.

7987789797 is a deficient number, since it is larger than the sum of its proper divisors (3488326491).

7987789797 is a wasteful number, since it uses less digits than its factorization.

7987789797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115540.

The product of its digits is 784147392, while the sum is 78.

The square root of 7987789797 is about 89374.4359254927. The cubic root of 7987789797 is about 1998.9819649736.

The spelling of 7987789797 in words is "seven billion, nine hundred eighty-seven million, seven hundred eighty-nine thousand, seven hundred ninety-seven".