77781797289 has 32 divisors (see below), whose sum is σ = 136235232000. Its totient is φ = 42914092032.

The previous prime is 77781797213. The next prime is 77781797309. The reversal of 77781797289 is 98279718777.

It is not a de Polignac number, because 77781797289 - 2⁹ = 77781796777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77781797189) 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, 7090104 + ... + 7101065.

It is an arithmetic number, because the mean of its divisors is an integer number (4257351000).

Almost surely, 2^77781797289 is an apocalyptic number.

It is an amenable number.

77781797289 is a deficient number, since it is larger than the sum of its proper divisors (58453434711).

77781797289 is a wasteful number, since it uses less digits than its factorization.

77781797289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191214 (or 14191208 counting only the distinct ones).

The product of its digits is 174254976, while the sum is 72.

The spelling of 77781797289 in words is "seventy-seven billion, seven hundred eighty-one million, seven hundred ninety-seven thousand, two hundred eighty-nine".