77648986788 has 24 divisors (see below), whose sum is σ = 181286171808. Its totient is φ = 25867966656.

The previous prime is 77648986783. The next prime is 77648986799. The reversal of 77648986788 is 88768984677.

It is not an unprimeable number, because it can be changed into a prime (77648986783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1857081 + ... + 1898432.

It is an arithmetic number, because the mean of its divisors is an integer number (7553590492).

Almost surely, 2^77648986788 is an apocalyptic number.

It is an amenable number.

77648986788 is an abundant number, since it is smaller than the sum of its proper divisors (103637185020).

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

77648986788 is a wasteful number, since it uses less digits than its factorization.

77648986788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757243 (or 3757241 counting only the distinct ones).

The product of its digits is 1820786688, while the sum is 78.

The spelling of 77648986788 in words is "seventy-seven billion, six hundred forty-eight million, nine hundred eighty-six thousand, seven hundred eighty-eight".