2668649 has 4 divisors (see below), whose sum is σ = 2733780. Its totient is φ = 2603520.

The previous prime is 2668639. The next prime is 2668663. The reversal of 2668649 is 9468662.

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 1545049 + 1123600 = 1243^2 + 1060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2668649 - 2¹² = 2664553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 65089 = 2668649 / (2 + 6 + 6 + 8 + 6 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2668619) 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, 32504 + ... + 32585.

It is an arithmetic number, because the mean of its divisors is an integer number (683445).

2^2668649 is an apocalyptic number.

It is an amenable number.

2668649 is a deficient number, since it is larger than the sum of its proper divisors (65131).

2668649 is an equidigital number, since it uses as much as digits as its factorization.

2668649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65130.

The product of its digits is 124416, while the sum is 41.

The square root of 2668649 is about 1633.6000122429. The cubic root of 2668649 is about 138.7066081882.

The spelling of 2668649 in words is "two million, six hundred sixty-eight thousand, six hundred forty-nine".