77977919724 has 12 divisors (see below), whose sum is σ = 181948479384. Its totient is φ = 25992639904.

The previous prime is 77977919687. The next prime is 77977919743. The reversal of 77977919724 is 42791977977.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3249079977 + ... + 3249080000.

It is an arithmetic number, because the mean of its divisors is an integer number (15162373282).

Almost surely, 2^77977919724 is an apocalyptic number.

It is an amenable number.

77977919724 is an abundant number, since it is smaller than the sum of its proper divisors (103970559660).

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

77977919724 is a wasteful number, since it uses less digits than its factorization.

77977919724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6498159984 (or 6498159982 counting only the distinct ones).

The product of its digits is 98018424, while the sum is 69.

The spelling of 77977919724 in words is "seventy-seven billion, nine hundred seventy-seven million, nine hundred nineteen thousand, seven hundred twenty-four".