77768486778 has 16 divisors (see below), whose sum is σ = 159740676000. Its totient is φ = 25222211856.

The previous prime is 77768486749. The next prime is 77768486813. The reversal of 77768486778 is 87768486777.

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, 175154028 + ... + 175154471.

It is an arithmetic number, because the mean of its divisors is an integer number (9983792250).

Almost surely, 2^77768486778 is an apocalyptic number.

77768486778 is an abundant number, since it is smaller than the sum of its proper divisors (81972189222).

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

77768486778 is a wasteful number, since it uses less digits than its factorization.

77768486778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350308541.

The product of its digits is 1239146496, while the sum is 75.

Subtracting 77768486778 from its reverse (87768486777), we obtain a palindrome (9999999999).

The spelling of 77768486778 in words is "seventy-seven billion, seven hundred sixty-eight million, four hundred eighty-six thousand, seven hundred seventy-eight".