9720946777 has 4 divisors (see below), whose sum is σ = 9721997236. Its totient is φ = 9719896320.

The previous prime is 9720946751. The next prime is 9720946787. The reversal of 9720946777 is 7776490279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5449540041 + 4271406736 = 73821^2 + 65356^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720946777 - 2¹⁵ = 9720914009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720946787) 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, 511224 + ... + 529897.

It is an arithmetic number, because the mean of its divisors is an integer number (2430499309).

Almost surely, 2^9720946777 is an apocalyptic number.

It is an amenable number.

9720946777 is a deficient number, since it is larger than the sum of its proper divisors (1050459).

9720946777 is a wasteful number, since it uses less digits than its factorization.

9720946777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050458.

The product of its (nonzero) digits is 9335088, while the sum is 58.

The square root of 9720946777 is about 98594.8618184538. The cubic root of 9720946777 is about 2134.2052723121.

The spelling of 9720946777 in words is "nine billion, seven hundred twenty million, nine hundred forty-six thousand, seven hundred seventy-seven".