2663645 has 8 divisors (see below), whose sum is σ = 3384504. Its totient is φ = 2005504.

The previous prime is 2663627. The next prime is 2663651. The reversal of 2663645 is 5463662.

2663645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1249924 + 1413721 = 1118^2 + 1189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2663645 - 2⁶ = 2663581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15584 + ... + 15753.

It is an arithmetic number, because the mean of its divisors is an integer number (423063).

2^2663645 is an apocalyptic number.

It is an amenable number.

2663645 is a deficient number, since it is larger than the sum of its proper divisors (720859).

2663645 is a wasteful number, since it uses less digits than its factorization.

2663645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31359.

The product of its digits is 25920, while the sum is 32.

The square root of 2663645 is about 1632.0677069289. The cubic root of 2663645 is about 138.6198574079.

The spelling of 2663645 in words is "two million, six hundred sixty-three thousand, six hundred forty-five".