77789256648 has 32 divisors (see below), whose sum is σ = 194479980000. Its totient is φ = 25928840448.

The previous prime is 77789256637. The next prime is 77789256653. The reversal of 77789256648 is 84665298777.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1278240 + ... + 1337712.

It is an arithmetic number, because the mean of its divisors is an integer number (6077499375).

Almost surely, 2^77789256648 is an apocalyptic number.

It is an amenable number.

77789256648 is an abundant number, since it is smaller than the sum of its proper divisors (116690723352).

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

77789256648 is a wasteful number, since it uses less digits than its factorization.

77789256648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113981 (or 113977 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 69.

The spelling of 77789256648 in words is "seventy-seven billion, seven hundred eighty-nine million, two hundred fifty-six thousand, six hundred forty-eight".