2640663 has 12 divisors (see below), whose sum is σ = 3879720. Its totient is φ = 1730256.

The previous prime is 2640643. The next prime is 2640683. The reversal of 2640663 is 3660462.

It is an interprime number because it is at equal distance from previous prime (2640643) and next prime (2640683).

It is not a de Polignac number, because 2640663 - 2¹⁰ = 2639639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1956 + ... + 3017.

It is an arithmetic number, because the mean of its divisors is an integer number (323310).

2^2640663 is an apocalyptic number.

2640663 is a deficient number, since it is larger than the sum of its proper divisors (1239057).

2640663 is a wasteful number, since it uses less digits than its factorization.

2640663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038 (or 5035 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 2640663 is about 1625.0116922656. The cubic root of 2640663 is about 138.2200333556.

The spelling of 2640663 in words is "two million, six hundred forty thousand, six hundred sixty-three".