6640530 has 32 divisors (see below), whose sum is σ = 17164224. Its totient is φ = 1634496.

The previous prime is 6640511. The next prime is 6640547. The reversal of 6640530 is 350466.

It is a self number, because there is not a number n which added to its sum of digits gives 6640530.

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 15 ways as a sum of consecutive naturals, for example, 8124 + ... + 8903.

It is an arithmetic number, because the mean of its divisors is an integer number (536382).

Almost surely, 2^6640530 is an apocalyptic number.

6640530 is an abundant number, since it is smaller than the sum of its proper divisors (10523694).

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

6640530 is a wasteful number, since it uses less digits than its factorization.

6640530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17050.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 6640530 is about 2576.9225832376. The cubic root of 6640530 is about 187.9609282014.

Adding to 6640530 its reverse (350466), we get a palindrome (6990996).

Subtracting from 6640530 its reverse (350466), we obtain a square (6290064 = 2508²).

The spelling of 6640530 in words is "six million, six hundred forty thousand, five hundred thirty".