7688881 has 2 divisors, whose sum is σ = 7688882. Its totient is φ = 7688880.

The previous prime is 7688861. The next prime is 7688887. The reversal of 7688881 is 1888867.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4661281 + 3027600 = 2159^2 + 1740^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688881 - 2⁷ = 7688753 is a prime.

It is a super-2 number, since 2×7688881² = 118237782064322, which contains 22 as substring.

7688881 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7688887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3844440 + 3844441.

It is an arithmetic number, because the mean of its divisors is an integer number (3844441).

Almost surely, 2^7688881 is an apocalyptic number.

It is an amenable number.

7688881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7688881 is an equidigital number, since it uses as much as digits as its factorization.

7688881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 46.

The square root of 7688881 is about 2772.8831565719. The cubic root of 7688881 is about 197.3729867532.

The spelling of 7688881 in words is "seven million, six hundred eighty-eight thousand, eight hundred eighty-one".