7798988788878 has 64 divisors (see below), whose sum is σ = 17845655569920. Its totient is φ = 2225859305472.

The previous prime is 7798988788711. The next prime is 7798988788931. The reversal of 7798988788878 is 8788878898977.

It is a happy number.

7798988788878 is a nontrivial binomial coefficient, being equal to C(3949428, 2).

It is a super-2 number, since 2×7798988788878² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165852426 + ... + 165899442.

It is an arithmetic number, because the mean of its divisors is an integer number (278838368280).

Almost surely, 2^{7798988788878} is an apocalyptic number.

7798988788878 is the 3949427-th triangular number and also the 1974714-th hexagonal number.

7798988788878 is an abundant number, since it is smaller than the sum of its proper divisors (10046666781042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7798988788878 is a wasteful number, since it uses less digits than its factorization.

7798988788878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51241.

The product of its digits is 407856218112, while the sum is 102.

The spelling of 7798988788878 in words is "seven trillion, seven hundred ninety-eight billion, nine hundred eighty-eight million, seven hundred eighty-eight thousand, eight hundred seventy-eight".