6640263 has 12 divisors (see below), whose sum is σ = 10961808. Its totient is φ = 3794400.

The previous prime is 6640241. The next prime is 6640289. The reversal of 6640263 is 3620466.

It is not a de Polignac number, because 6640263 - 2¹⁴ = 6623879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640213) 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 11 ways as a sum of consecutive naturals, for example, 52638 + ... + 52763.

It is an arithmetic number, because the mean of its divisors is an integer number (913484).

Almost surely, 2^6640263 is an apocalyptic number.

6640263 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

6640263 is a deficient number, since it is larger than the sum of its proper divisors (4321545).

6640263 is a wasteful number, since it uses less digits than its factorization.

6640263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105414 (or 105411 counting only the distinct ones).

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

The square root of 6640263 is about 2576.8707767368. The cubic root of 6640263 is about 187.9584090129.

It can be divided in two parts, 6640 and 263, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 6640263 in words is "six million, six hundred forty thousand, two hundred sixty-three".