7669681 has 2 divisors, whose sum is σ = 7669682. Its totient is φ = 7669680.

The previous prime is 7669667. The next prime is 7669687. The reversal of 7669681 is 1869667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7612081 + 57600 = 2759^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 7669681 - 2⁷ = 7669553 is a prime.

It is a super-2 number, since 2×7669681² = 117648013283522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7669687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3834840 + 3834841.

It is an arithmetic number, because the mean of its divisors is an integer number (3834841).

Almost surely, 2^7669681 is an apocalyptic number.

It is an amenable number.

7669681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7669681 is an equidigital number, since it uses as much as digits as its factorization.

7669681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 7669681 is about 2769.4188921144. The cubic root of 7669681 is about 197.2085623049.

The spelling of 7669681 in words is "seven million, six hundred sixty-nine thousand, six hundred eighty-one".