7808681 has 2 divisors, whose sum is σ = 7808682. Its totient is φ = 7808680.

The previous prime is 7808657. The next prime is 7808687. The reversal of 7808681 is 1868087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5248681 + 2560000 = 2291^2 + 1600^2 .

It is a cyclic number.

It is not a de Polignac number, because 7808681 - 2⁶ = 7808617 is a prime.

It is a super-2 number, since 2×7808681² = 121950997919522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7808687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3904340 + 3904341.

It is an arithmetic number, because the mean of its divisors is an integer number (3904341).

Almost surely, 2^7808681 is an apocalyptic number.

It is an amenable number.

7808681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7808681 is an equidigital number, since it uses as much as digits as its factorization.

7808681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 7808681 is about 2794.4017248778. The cubic root of 7808681 is about 198.3927940416.

The spelling of 7808681 in words is "seven million, eight hundred eight thousand, six hundred eighty-one".