7644004909 has 2 divisors, whose sum is σ = 7644004910. Its totient is φ = 7644004908.

The previous prime is 7644004889. The next prime is 7644004939. The reversal of 7644004909 is 9094004467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7644004900 + 9 = 87430^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 7644004909 - 2⁵ = 7644004877 is a prime.

It is a super-2 number, since 2×7644004909² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7644004939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3822002454 + 3822002455.

It is an arithmetic number, because the mean of its divisors is an integer number (3822002455).

Almost surely, 2^7644004909 is an apocalyptic number.

It is an amenable number.

7644004909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7644004909 is an equidigital number, since it uses as much as digits as its factorization.

7644004909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 7644004909 is about 87430.0000514697. Note that the first 4 decimals coincide. The cubic root of 7644004909 is about 1969.8824866559.

The spelling of 7644004909 in words is "seven billion, six hundred forty-four million, four thousand, nine hundred nine".