2644661 has 4 divisors (see below), whose sum is σ = 2649324. Its totient is φ = 2640000.

The previous prime is 2644657. The next prime is 2644669. The reversal of 2644661 is 1664462.

2644661 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 2 ways, for example, as 970225 + 1674436 = 985^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 2644661 - 2² = 2644657 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 6² + 4⁶ + 4⁹ + 6⁴ + 6⁷ + 1 .

It is a Duffinian number.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 1340 + ... + 2661.

It is an arithmetic number, because the mean of its divisors is an integer number (662331).

2^2644661 is an apocalyptic number.

It is an amenable number.

2644661 is a deficient number, since it is larger than the sum of its proper divisors (4663).

2644661 is an equidigital number, since it uses as much as digits as its factorization.

2644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662.

The product of its digits is 6912, while the sum is 29.

The square root of 2644661 is about 1626.2413719986. The cubic root of 2644661 is about 138.2897538569.

It can be divided in two parts, 2644 and 661, that multiplied together give a square (1747684 = 1322²).

The spelling of 2644661 in words is "two million, six hundred forty-four thousand, six hundred sixty-one".