7688681 has 16 divisors (see below), whose sum is σ = 10324608. Its totient is φ = 5529600.

The previous prime is 7688677. The next prime is 7688687. The reversal of 7688681 is 1868867.

It is a cyclic number.

It is not a de Polignac number, because 7688681 - 2² = 7688677 is a prime.

It is a super-2 number, since 2×7688681² = 118231631039522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7688687) 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 in 15 ways as a sum of consecutive naturals, for example, 2840 + ... + 4841.

It is an arithmetic number, because the mean of its divisors is an integer number (645288).

Almost surely, 2^7688681 is an apocalyptic number.

It is an amenable number.

7688681 is a deficient number, since it is larger than the sum of its proper divisors (2635927).

7688681 is a wasteful number, since it uses less digits than its factorization.

7688681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712.

The product of its digits is 129024, while the sum is 44.

The square root of 7688681 is about 2772.8470927911. The cubic root of 7688681 is about 197.3712754101.

It can be divided in two parts, 76886 and 81, that added together give a palindrome (76967).

The spelling of 7688681 in words is "seven million, six hundred eighty-eight thousand, six hundred eighty-one".