7678609 has 2 divisors, whose sum is σ = 7678610. Its totient is φ = 7678608.

The previous prime is 7678597. The next prime is 7678613. The reversal of 7678609 is 9068767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7617600 + 61009 = 2760^2 + 247^2 .

It is an emirp because it is prime and its reverse (9068767) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7678609 - 2¹⁷ = 7547537 is a prime.

It is a super-2 number, since 2×7678609² = 117922072349762, which contains 22 as substring.

7678609 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7678309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3839304 + 3839305.

It is an arithmetic number, because the mean of its divisors is an integer number (3839305).

Almost surely, 2^7678609 is an apocalyptic number.

It is an amenable number.

7678609 is a deficient number, since it is larger than the sum of its proper divisors (1).

7678609 is an equidigital number, since it uses as much as digits as its factorization.

7678609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 7678609 is about 2771.0303138003. The cubic root of 7678609 is about 197.2850537654.

The spelling of 7678609 in words is "seven million, six hundred seventy-eight thousand, six hundred nine".