77939486368 has 24 divisors (see below), whose sum is σ = 156708119232. Its totient is φ = 38140598976.

The previous prime is 77939486333. The next prime is 77939486369. The reversal of 77939486368 is 86368493977.

It is a junction number, because it is equal to n+sod(n) for n = 77939486297 and 77939486306.

It is not an unprimeable number, because it can be changed into a prime (77939486369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25909230 + ... + 25912237.

It is an arithmetic number, because the mean of its divisors is an integer number (6529504968).

Almost surely, 2^77939486368 is an apocalyptic number.

It is an amenable number.

77939486368 is an abundant number, since it is smaller than the sum of its proper divisors (78768632864).

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

77939486368 is a wasteful number, since it uses less digits than its factorization.

77939486368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51821524 (or 51821516 counting only the distinct ones).

The product of its digits is 329204736, while the sum is 70.

The spelling of 77939486368 in words is "seventy-seven billion, nine hundred thirty-nine million, four hundred eighty-six thousand, three hundred sixty-eight".