77381990684 has 12 divisors (see below), whose sum is σ = 135999680544. Its totient is φ = 38524939104.

The previous prime is 77381990681. The next prime is 77381990747. The reversal of 77381990684 is 48609918377.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77381990681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41513012 + ... + 41514875.

It is an arithmetic number, because the mean of its divisors is an integer number (11333306712).

Almost surely, 2^77381990684 is an apocalyptic number.

It is an amenable number.

77381990684 is a deficient number, since it is larger than the sum of its proper divisors (58617689860).

77381990684 is a wasteful number, since it uses less digits than its factorization.

77381990684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83028124 (or 83028122 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 77381990684 in words is "seventy-seven billion, three hundred eighty-one million, nine hundred ninety thousand, six hundred eighty-four".