978987789879 has 128 divisors (see below), whose sum is σ = 1514341785600. Its totient is φ = 557116869120.

The previous prime is 978987789859. The next prime is 978987789887.

978987789879 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 978987789879 - 2⁷ = 978987789751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978987789859) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1946297542 + ... + 1946298044.

It is an arithmetic number, because the mean of its divisors is an integer number (11830795200).

Almost surely, 2^978987789879 is an apocalyptic number.

978987789879 is a deficient number, since it is larger than the sum of its proper divisors (535353995721).

978987789879 is a wasteful number, since it uses less digits than its factorization.

978987789879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 64524128256, while the sum is 96.

The spelling of 978987789879 in words is "nine hundred seventy-eight billion, nine hundred eighty-seven million, seven hundred eighty-nine thousand, eight hundred seventy-nine".