7720780247 has 16 divisors (see below), whose sum is σ = 8078514048. Its totient is φ = 7372179360.

The previous prime is 7720780219. The next prime is 7720780253. The reversal of 7720780247 is 7420870277.

It is a cyclic number.

It is not a de Polignac number, because 7720780247 - 2⁶ = 7720780183 is a prime.

It is a super-2 number, since 2×7720780247² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7720780198 and 7720780207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7720780747) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 638972 + ... + 650942.

It is an arithmetic number, because the mean of its divisors is an integer number (504907128).

Almost surely, 2^7720780247 is an apocalyptic number.

7720780247 is a deficient number, since it is larger than the sum of its proper divisors (357733801).

7720780247 is a wasteful number, since it uses less digits than its factorization.

7720780247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12350.

The product of its (nonzero) digits is 307328, while the sum is 44.

The square root of 7720780247 is about 87867.9705410339. The cubic root of 7720780247 is about 1976.4556056272.

The spelling of 7720780247 in words is "seven billion, seven hundred twenty million, seven hundred eighty thousand, two hundred forty-seven".