8278649 has 2 divisors, whose sum is σ = 8278650. Its totient is φ = 8278648.

The previous prime is 8278637. The next prime is 8278651. The reversal of 8278649 is 9468728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5968249 + 2310400 = 2443^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 8278649 - 2⁸ = 8278393 is a prime.

Together with 8278651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8278619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4139324 + 4139325.

It is an arithmetic number, because the mean of its divisors is an integer number (4139325).

Almost surely, 2^8278649 is an apocalyptic number.

It is an amenable number.

8278649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8278649 is an equidigital number, since it uses as much as digits as its factorization.

8278649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 8278649 is about 2877.2641519332. The cubic root of 8278649 is about 202.2956247216.

The spelling of 8278649 in words is "eight million, two hundred seventy-eight thousand, six hundred forty-nine".