2568689 has 2 divisors, whose sum is σ = 2568690. Its totient is φ = 2568688.

The previous prime is 2568673. The next prime is 2568697. The reversal of 2568689 is 9868652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2534464 + 34225 = 1592^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2568689 - 2⁴ = 2568673 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2568619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284344 + 1284345.

It is an arithmetic number, because the mean of its divisors is an integer number (1284345).

2^2568689 is an apocalyptic number.

It is an amenable number.

2568689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568689 is an equidigital number, since it uses as much as digits as its factorization.

2568689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 2568689 is about 1602.7130123637. The cubic root of 2568689 is about 136.9526715946.

The spelling of 2568689 in words is "two million, five hundred sixty-eight thousand, six hundred eighty-nine".