77721467064 has 32 divisors (see below), whose sum is σ = 195280080000. Its totient is φ = 25776967392.

The previous prime is 77721467053. The next prime is 77721467077. The reversal of 77721467064 is 46076412777.

It is a junction number, because it is equal to n+sod(n) for n = 77721466998 and 77721467016.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8131894 + ... + 8141445.

It is an arithmetic number, because the mean of its divisors is an integer number (6102502500).

Almost surely, 2^77721467064 is an apocalyptic number.

It is an amenable number.

77721467064 is an abundant number, since it is smaller than the sum of its proper divisors (117558612936).

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

77721467064 is a wasteful number, since it uses less digits than its factorization.

77721467064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16273547 (or 16273543 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 51.

The spelling of 77721467064 in words is "seventy-seven billion, seven hundred twenty-one million, four hundred sixty-seven thousand, sixty-four".