7688888861 has 4 divisors (see below), whose sum is σ = 7693217532. Its totient is φ = 7684560192.

The previous prime is 7688888849. The next prime is 7688888903. The reversal of 7688888861 is 1688888867.

7688888861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 1901483236 + 5787405625 = 43606^2 + 76075^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688888861 - 2⁶ = 7688888797 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7688888791 and 7688888800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688888461) 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, 2161670 + ... + 2165223.

It is an arithmetic number, because the mean of its divisors is an integer number (1923304383).

Almost surely, 2^7688888861 is an apocalyptic number.

It is an amenable number.

7688888861 is a deficient number, since it is larger than the sum of its proper divisors (4328671).

7688888861 is a wasteful number, since it uses less digits than its factorization.

7688888861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328670.

The product of its digits is 66060288, while the sum is 68.

The square root of 7688888861 is about 87686.3094274129. The cubic root of 7688888861 is about 1973.7305401691.

The spelling of 7688888861 in words is "seven billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred sixty-one".