7728868739 has 2 divisors, whose sum is σ = 7728868740. Its totient is φ = 7728868738.

The previous prime is 7728868663. The next prime is 7728868747. The reversal of 7728868739 is 9378688277.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7728868739 is a prime.

It is not a weakly prime, because it can be changed into another prime (7728868769) 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 as a sum of consecutive naturals, namely, 3864434369 + 3864434370.

It is an arithmetic number, because the mean of its divisors is an integer number (3864434370).

Almost surely, 2^7728868739 is an apocalyptic number.

7728868739 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728868739 is an equidigital number, since it uses as much as digits as its factorization.

7728868739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56899584, while the sum is 65.

The square root of 7728868739 is about 87913.9848886399. The cubic root of 7728868739 is about 1977.1455603316.

The spelling of 7728868739 in words is "seven billion, seven hundred twenty-eight million, eight hundred sixty-eight thousand, seven hundred thirty-nine".