77909388560 has 80 divisors (see below), whose sum is σ = 195532842240. Its totient is φ = 28780899840.

The previous prime is 77909388541. The next prime is 77909388563. The reversal of 77909388560 is 6588390977.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 77909388493 and 77909388502.

It is not an unprimeable number, because it can be changed into a prime (77909388563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 676676 + ... + 783395.

It is an arithmetic number, because the mean of its divisors is an integer number (2444160528).

Almost surely, 2^77909388560 is an apocalyptic number.

It is an amenable number.

77909388560 is an abundant number, since it is smaller than the sum of its proper divisors (117623453680).

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

77909388560 is a wasteful number, since it uses less digits than its factorization.

77909388560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460136 (or 1460130 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 77909388560 in words is "seventy-seven billion, nine hundred nine million, three hundred eighty-eight thousand, five hundred sixty".