7977117798 has 24 divisors (see below), whose sum is σ = 18613275408. Its totient is φ = 2454497712.

The previous prime is 7977117773. The next prime is 7977117839. The reversal of 7977117798 is 8977117797.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17044890 + ... + 17045357.

It is an arithmetic number, because the mean of its divisors is an integer number (775553142).

Almost surely, 2^7977117798 is an apocalyptic number.

7977117798 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

7977117798 is an abundant number, since it is smaller than the sum of its proper divisors (10636157610).

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

7977117798 is a wasteful number, since it uses less digits than its factorization.

7977117798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34090268 (or 34090265 counting only the distinct ones).

The product of its digits is 10890936, while the sum is 63.

The square root of 7977117798 is about 89314.7121027661. The cubic root of 7977117798 is about 1998.0913289001.

Subtracting 7977117798 from its reverse (8977117797), we obtain a palindrome (999999999).

The spelling of 7977117798 in words is "seven billion, nine hundred seventy-seven million, one hundred seventeen thousand, seven hundred ninety-eight".