7788727861 has 2 divisors, whose sum is σ = 7788727862. Its totient is φ = 7788727860.

The previous prime is 7788727853. The next prime is 7788727873. The reversal of 7788727861 is 1687278877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7622163025 + 166564836 = 87305^2 + 12906^2 .

It is an emirp because it is prime and its reverse (1687278877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7788727861 - 2³ = 7788727853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7788727861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7788727561) 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, 3894363930 + 3894363931.

It is an arithmetic number, because the mean of its divisors is an integer number (3894363931).

Almost surely, 2^7788727861 is an apocalyptic number.

It is an amenable number.

7788727861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7788727861 is an equidigital number, since it uses as much as digits as its factorization.

7788727861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14751744, while the sum is 61.

The square root of 7788727861 is about 88253.7696701960. The cubic root of 7788727861 is about 1982.2366878670.

The spelling of 7788727861 in words is "seven billion, seven hundred eighty-eight million, seven hundred twenty-seven thousand, eight hundred sixty-one".