6640512 has 32 divisors (see below), whose sum is σ = 17639880. Its totient is φ = 2213376.

The previous prime is 6640511. The next prime is 6640547. The reversal of 6640512 is 2150466.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8263 + ... + 9030.

Almost surely, 2^6640512 is an apocalyptic number.

It is an amenable number.

6640512 is an abundant number, since it is smaller than the sum of its proper divisors (10999368).

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

6640512 is a wasteful number, since it uses less digits than its factorization.

6640512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17310 (or 17298 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 6640512 is about 2576.9190906973. The cubic root of 6640512 is about 187.9607583706.

Adding to 6640512 its reverse (2150466), we get a palindrome (8790978).

The spelling of 6640512 in words is "six million, six hundred forty thousand, five hundred twelve".