7678681 has 2 divisors, whose sum is σ = 7678682.
Its totient is φ = 7678680.
The previous prime is 7678667. The next prime is 7678709. The reversal of 7678681 is 1868767.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7070281 + 608400 = 2659^2 + 780^2
It is a cyclic number.
It is not a de Polignac number, because 7678681 - 211 = 7676633 is a prime.
It is a super-2 number, since 2×76786812 = 117924283799522, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (7678621) 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, 3839340 + 3839341.
It is an arithmetic number, because the mean of its divisors is an integer number (3839341).
Almost surely, 27678681 is an apocalyptic number.
It is an amenable number.
7678681 is a deficient number, since it is larger than the sum of its proper divisors (1).
7678681 is an equidigital number, since it uses as much as digits as its factorization.
7678681 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 112896, while the sum is 43.
The square root of 7678681 is about 2771.0433053274.
The cubic root of 7678681 is about 197.2856703910.
It can be divided in two parts, 76786 and 81, that added together give a palindrome (76867).
The spelling of 7678681 in words is "seven million, six hundred seventy-eight thousand, six hundred eighty-one".