2644663 has 4 divisors (see below), whose sum is σ = 3022480. Its totient is φ = 2266848.

The previous prime is 2644657. The next prime is 2644669. The reversal of 2644663 is 3664462.

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

It is an interprime number because it is at equal distance from previous prime (2644657) and next prime (2644669).

It is a cyclic number.

It is not a de Polignac number, because 2644663 - 2⁹ = 2644151 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 6 + 4⁵ + 4¹⁰ + 6 + 6³ + 3¹³ .

It is a Duffinian number.

2644663 is a lucky 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188898 + ... + 188911.

It is an arithmetic number, because the mean of its divisors is an integer number (755620).

2^2644663 is an apocalyptic number.

2644663 is a deficient number, since it is larger than the sum of its proper divisors (377817).

2644663 is an equidigital number, since it uses as much as digits as its factorization.

2644663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377816.

The product of its digits is 20736, while the sum is 31.

The square root of 2644663 is about 1626.2419869134. The cubic root of 2644663 is about 138.2897887170.

The spelling of 2644663 in words is "two million, six hundred forty-four thousand, six hundred sixty-three".