6640516 has 12 divisors (see below), whose sum is σ = 11659788. Its totient is φ = 3309152.

The previous prime is 6640511. The next prime is 6640547. The reversal of 6640516 is 6150466.

It can be written as a sum of positive squares in 2 ways, for example, as 2822400 + 3818116 = 1680^2 + 1954^2 .

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, 1351 + ... + 3886.

It is an arithmetic number, because the mean of its divisors is an integer number (971649).

Almost surely, 2^6640516 is an apocalyptic number.

It is an amenable number.

6640516 is a deficient number, since it is larger than the sum of its proper divisors (5019272).

6640516 is a wasteful number, since it uses less digits than its factorization.

6640516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558 (or 5556 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6640516 is about 2576.9198668177. The cubic root of 6640516 is about 187.9607961108.

The spelling of 6640516 in words is "six million, six hundred forty thousand, five hundred sixteen".