77904771365784 has 256 divisors, whose sum is σ = 226616342492160. Its totient is φ = 22056007680000.

The previous prime is 77904771365783. The next prime is 77904771365789. The reversal of 77904771365784 is 48756317740977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77904771365783) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 971086794 + ... + 971167014.

It is an arithmetic number, because the mean of its divisors is an integer number (885220087860).

Almost surely, 2^{77904771365784} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77904771365784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113308171246080).

77904771365784 is an abundant number, since it is smaller than the sum of its proper divisors (148711571126376).

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

77904771365784 is a wasteful number, since it uses less digits than its factorization.

77904771365784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81842 (or 81838 counting only the distinct ones).

The product of its (nonzero) digits is 1742549760, while the sum is 75.

The spelling of 77904771365784 in words is "seventy-seven trillion, nine hundred four billion, seven hundred seventy-one million, three hundred sixty-five thousand, seven hundred eighty-four".