6640023 has 16 divisors (see below), whose sum is σ = 9646560. Its totient is φ = 4038144.

The previous prime is 6640021. The next prime is 6640027. The reversal of 6640023 is 3200466.

It is not a de Polignac number, because 6640023 - 2¹ = 6640021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2515 + ... + 4427.

It is an arithmetic number, because the mean of its divisors is an integer number (602910).

Almost surely, 2^6640023 is an apocalyptic number.

6640023 is a deficient number, since it is larger than the sum of its proper divisors (3006537).

6640023 is a wasteful number, since it uses less digits than its factorization.

6640023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 6640023 is about 2576.8242082067. The cubic root of 6640023 is about 187.9561445162.

Adding to 6640023 its reverse (3200466), we get a palindrome (9840489).

The spelling of 6640023 in words is "six million, six hundred forty thousand, twenty-three".