6644916 has 30 divisors (see below), whose sum is σ = 17371970. Its totient is φ = 2214864.

The previous prime is 6644903. The next prime is 6644933. The reversal of 6644916 is 6194466.

6644916 is a `hidden beast` number, since 6 + 644 + 9 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4822416 + 1822500 = 2196^2 + 1350^2 .

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

It is a nude number because it is divisible by every one of its digits.

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 9 ways as a sum of consecutive naturals, for example, 9931 + ... + 10578.

Almost surely, 2^6644916 is an apocalyptic number.

It is an amenable number.

6644916 is an abundant number, since it is smaller than the sum of its proper divisors (10727054).

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

6644916 is a wasteful number, since it uses less digits than its factorization.

6644916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20525 (or 20514 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 6644916 is about 2577.7734578508. The cubic root of 6644916 is about 188.0023011639.

The spelling of 6644916 in words is "six million, six hundred forty-four thousand, nine hundred sixteen".