2644666 has 4 divisors (see below), whose sum is σ = 3967002. Its totient is φ = 1322332.

The previous prime is 2644657. The next prime is 2644669. The reversal of 2644666 is 6664462.

2644666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 1510441 + 1134225 = 1229^2 + 1065^2 .

It is a d-powerful number, because it can be written as 2²¹ + 6 + 4⁶ + 4⁹ + 6² + 6⁴ + 6⁷ .

It is not an unprimeable number, because it can be changed into a prime (2644669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661165 + ... + 661168.

2^2644666 is an apocalyptic number.

2644666 is a deficient number, since it is larger than the sum of its proper divisors (1322336).

2644666 is a wasteful number, since it uses less digits than its factorization.

2644666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322335.

The product of its digits is 41472, while the sum is 34.

The square root of 2644666 is about 1626.2429092851. The cubic root of 2644666 is about 138.2898410071.

The spelling of 2644666 in words is "two million, six hundred forty-four thousand, six hundred sixty-six".