77819734836 has 72 divisors (see below), whose sum is σ = 205421920704. Its totient is φ = 24792958080.

The previous prime is 77819734829. The next prime is 77819734877. The reversal of 77819734836 is 63843791877.

77819734836 is a `hidden beast` number, since 7 + 7 + 81 + 9 + 73 + 483 + 6 = 666.

It is a super-2 number, since 2×77819734836² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1058215 + ... + 1129361.

It is an arithmetic number, because the mean of its divisors is an integer number (2853082232).

Almost surely, 2^77819734836 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 77819734836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102710960352).

77819734836 is an abundant number, since it is smaller than the sum of its proper divisors (127602185868).

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

77819734836 is a wasteful number, since it uses less digits than its factorization.

77819734836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72501 (or 72496 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 63.

The spelling of 77819734836 in words is "seventy-seven billion, eight hundred nineteen million, seven hundred thirty-four thousand, eight hundred thirty-six".