7797997976 has 8 divisors (see below), whose sum is σ = 14621246220. Its totient is φ = 3898998984.

The previous prime is 7797997967. The next prime is 7797997981. The reversal of 7797997976 is 6797997977.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 7797997897 and 7797997906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487374866 + ... + 487374881.

Almost surely, 2^7797997976 is an apocalyptic number.

It is an amenable number.

7797997976 is a deficient number, since it is larger than the sum of its proper divisors (6823248244).

7797997976 is a wasteful number, since it uses less digits than its factorization.

7797997976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974749753 (or 974749749 counting only the distinct ones).

The product of its digits is 661624362, while the sum is 77.

The square root of 7797997976 is about 88306.2737069117. The cubic root of 7797997976 is about 1983.0227929932.

Subtracting from 7797997976 its reverse (6797997977), we obtain a palindrome (999999999).

The spelling of 7797997976 in words is "seven billion, seven hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred seventy-six".