7797997977 has 32 divisors (see below), whose sum is σ = 12973685760. Its totient is φ = 4047539520.

The previous prime is 7797997967. The next prime is 7797997981.

7797997977 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 7797997977 - 2⁸ = 7797997721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7797997967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277423 + ... + 304235.

It is an arithmetic number, because the mean of its divisors is an integer number (405427680).

Almost surely, 2^7797997977 is an apocalyptic number.

7797997977 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

7797997977 is a deficient number, since it is larger than the sum of its proper divisors (5175687783).

7797997977 is a wasteful number, since it uses less digits than its factorization.

7797997977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28093.

The product of its digits is 771895089, while the sum is 78.

The square root of 7797997977 is about 88306.2737125738. The cubic root of 7797997977 is about 1983.0227930780.

The spelling of 7797997977 in words is "seven billion, seven hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred seventy-seven".