77807886912 has 168 divisors, whose sum is σ = 254998719872. Its totient is φ = 22220697600.

The previous prime is 77807886911. The next prime is 77807886983. The reversal of 77807886912 is 21968870877.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 77807886912.

It is not an unprimeable number, because it can be changed into a prime (77807886911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17057112 + ... + 17061672.

Almost surely, 2^77807886912 is an apocalyptic number.

77807886912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77807886912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127499359936).

77807886912 is an abundant number, since it is smaller than the sum of its proper divisors (177190832960).

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

77807886912 is a wasteful number, since it uses less digits than its factorization.

77807886912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8817 (or 8804 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 63.

The spelling of 77807886912 in words is "seventy-seven billion, eight hundred seven million, eight hundred eighty-six thousand, nine hundred twelve".