6640266 has 16 divisors (see below), whose sum is σ = 13449600. Its totient is φ = 2185248.

The previous prime is 6640241. The next prime is 6640289. The reversal of 6640266 is 6620466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6531 + ... + 7478.

It is an arithmetic number, because the mean of its divisors is an integer number (840600).

Almost surely, 2^6640266 is an apocalyptic number.

6640266 is an abundant number, since it is smaller than the sum of its proper divisors (6809334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640266 is a wasteful number, since it uses less digits than its factorization.

6640266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14093.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6640266 is about 2576.8713588381. The cubic root of 6640266 is about 187.9584373188.

The spelling of 6640266 in words is "six million, six hundred forty thousand, two hundred sixty-six".