77020680676 has 9 divisors (see below), whose sum is σ = 134787162531. Its totient is φ = 38510062812.

The previous prime is 77020680673. The next prime is 77020680719. The reversal of 77020680676 is 67608602077.

The square root of 77020680676 is 277526.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77020680673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 485671 + ... + 624433.

Almost surely, 2^77020680676 is an apocalyptic number.

77020680676 is the 277526-th square number.

It is an amenable number.

77020680676 is a deficient number, since it is larger than the sum of its proper divisors (57766481855).

77020680676 is an frugal number, since it uses more digits than its factorization.

77020680676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277530 (or 138765 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 49.

Multiplying 77020680676 by its sum of digits (49), we get a square (3774013353124 = 1942682²).

The spelling of 77020680676 in words is "seventy-seven billion, twenty million, six hundred eighty thousand, six hundred seventy-six".