6621644 has 12 divisors (see below), whose sum is σ = 11610984. Its totient is φ = 3304224.

The previous prime is 6621607. The next prime is 6621649. The reversal of 6621644 is 4461266.

It is not an unprimeable number, because it can be changed into a prime (6621649) 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, 1127 + ... + 3809.

It is an arithmetic number, because the mean of its divisors is an integer number (967582).

Almost surely, 2^6621644 is an apocalyptic number.

It is an amenable number.

6621644 is a deficient number, since it is larger than the sum of its proper divisors (4989340).

6621644 is a wasteful number, since it uses less digits than its factorization.

6621644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304 (or 3302 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 6621644 is about 2573.2555255940. The cubic root of 6621644 is about 187.7825689080.

The spelling of 6621644 in words is "six million, six hundred twenty-one thousand, six hundred forty-four".