6647616 has 56 divisors (see below), whose sum is σ = 19547840. Its totient is φ = 2215296.

The previous prime is 6647593. The next prime is 6647623. The reversal of 6647616 is 6167466.

6647616 is a `hidden beast` number, since 6 + 647 + 6 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 196 + ... + 3651.

Almost surely, 2^6647616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6647616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9773920).

6647616 is an abundant number, since it is smaller than the sum of its proper divisors (12900224).

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

6647616 is a wasteful number, since it uses less digits than its factorization.

6647616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3868 (or 3852 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 6647616 is about 2578.2971124368. The cubic root of 6647616 is about 188.0277611034.

The spelling of 6647616 in words is "six million, six hundred forty-seven thousand, six hundred sixteen".