77810812144 has 20 divisors (see below), whose sum is σ = 162355252696. Its totient is φ = 35912682432.

The previous prime is 77810812139. The next prime is 77810812187. The reversal of 77810812144 is 44121801877.

It is a self number, because there is not a number n which added to its sum of digits gives 77810812144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187045014 + ... + 187045429.

Almost surely, 2^77810812144 is an apocalyptic number.

It is an amenable number.

77810812144 is an abundant number, since it is smaller than the sum of its proper divisors (84544440552).

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

77810812144 is a wasteful number, since it uses less digits than its factorization.

77810812144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374090464 (or 374090458 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 43.

The spelling of 77810812144 in words is "seventy-seven billion, eight hundred ten million, eight hundred twelve thousand, one hundred forty-four".