77758807768 has 8 divisors (see below), whose sum is σ = 145797764580. Its totient is φ = 38879403880.

The previous prime is 77758807739. The next prime is 77758807769. The reversal of 77758807768 is 86770885777.

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 = 77758807697 and 77758807706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77758807769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859925478 + ... + 4859925493.

Almost surely, 2^77758807768 is an apocalyptic number.

It is an amenable number.

77758807768 is a deficient number, since it is larger than the sum of its proper divisors (68038956812).

77758807768 is a wasteful number, since it uses less digits than its factorization.

77758807768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9719850977 (or 9719850973 counting only the distinct ones).

The product of its (nonzero) digits is 258155520, while the sum is 70.

The spelling of 77758807768 in words is "seventy-seven billion, seven hundred fifty-eight million, eight hundred seven thousand, seven hundred sixty-eight".