77721838760 has 64 divisors (see below), whose sum is σ = 175776713280. Its totient is φ = 30928576000.

The previous prime is 77721838709. The next prime is 77721838783. The reversal of 77721838760 is 6783812777.

It is a junction number, because it is equal to n+sod(n) for n = 77721838696 and 77721838705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9564059 + ... + 9572181.

It is an arithmetic number, because the mean of its divisors is an integer number (2746511145).

Almost surely, 2^77721838760 is an apocalyptic number.

It is an amenable number.

77721838760 is an abundant number, since it is smaller than the sum of its proper divisors (98054874520).

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

77721838760 is a wasteful number, since it uses less digits than its factorization.

77721838760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9338 (or 9334 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 56.

The spelling of 77721838760 in words is "seventy-seven billion, seven hundred twenty-one million, eight hundred thirty-eight thousand, seven hundred sixty".