2668289 has 4 divisors (see below), whose sum is σ = 2873556. Its totient is φ = 2463024.

The previous prime is 2668277. The next prime is 2668297. The reversal of 2668289 is 9828662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 2226064 = 665^2 + 1492^2 .

It is a cyclic number.

It is not a de Polignac number, because 2668289 - 2²⁰ = 1619713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2668219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102614 + ... + 102639.

It is an arithmetic number, because the mean of its divisors is an integer number (718389).

2^2668289 is an apocalyptic number.

It is an amenable number.

2668289 is a deficient number, since it is larger than the sum of its proper divisors (205267).

2668289 is a wasteful number, since it uses less digits than its factorization.

2668289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205266.

The product of its digits is 82944, while the sum is 41.

The square root of 2668289 is about 1633.4898224354. The cubic root of 2668289 is about 138.7003707469.

The spelling of 2668289 in words is "two million, six hundred sixty-eight thousand, two hundred eighty-nine".