77964236836 has 6 divisors (see below), whose sum is σ = 136437414470. Its totient is φ = 38982118416.

The previous prime is 77964236827. The next prime is 77964236893. The reversal of 77964236836 is 63863246977.

It can be written as a sum of positive squares in only one way, i.e., 68405263936 + 9558972900 = 261544^2 + 97770^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9745529601 + ... + 9745529608.

Almost surely, 2^77964236836 is an apocalyptic number.

It is an amenable number.

77964236836 is a deficient number, since it is larger than the sum of its proper divisors (58473177634).

77964236836 is a wasteful number, since it uses less digits than its factorization.

77964236836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19491059213 (or 19491059211 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 61.

The spelling of 77964236836 in words is "seventy-seven billion, nine hundred sixty-four million, two hundred thirty-six thousand, eight hundred thirty-six".