7678663 has 2 divisors, whose sum is σ = 7678664. Its totient is φ = 7678662.

The previous prime is 7678661. The next prime is 7678667. The reversal of 7678663 is 3668767.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7678663 - 2¹ = 7678661 is a prime.

Together with 7678661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7678661) 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, 3839331 + 3839332.

It is an arithmetic number, because the mean of its divisors is an integer number (3839332).

Almost surely, 2^7678663 is an apocalyptic number.

7678663 is a deficient number, since it is larger than the sum of its proper divisors (1).

7678663 is an equidigital number, since it uses as much as digits as its factorization.

7678663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 43.

The square root of 7678663 is about 2771.0400574514. The cubic root of 7678663 is about 197.2855162350.

The spelling of 7678663 in words is "seven million, six hundred seventy-eight thousand, six hundred sixty-three".