77844793339680 has 192 divisors, whose sum is σ = 256094411892480. Its totient is φ = 19838838767616.

The previous prime is 77844793339679. The next prime is 77844793339697. The reversal of 77844793339680 is 8693339744877.

It is a junction number, because it is equal to n+sod(n) for n = 77844793339596 and 77844793339605.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9671376 + ... + 15786864.

It is an arithmetic number, because the mean of its divisors is an integer number (1333825061940).

Almost surely, 2^{77844793339680} 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 77844793339680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128047205946240).

77844793339680 is an abundant number, since it is smaller than the sum of its proper divisors (178249618552800).

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

77844793339680 is a wasteful number, since it uses less digits than its factorization.

77844793339680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116683 (or 6116675 counting only the distinct ones).

The product of its (nonzero) digits is 4608866304, while the sum is 78.

The spelling of 77844793339680 in words is "seventy-seven trillion, eight hundred forty-four billion, seven hundred ninety-three million, three hundred thirty-nine thousand, six hundred eighty".