6644628 has 36 divisors (see below), whose sum is σ = 16875040. Its totient is φ = 2204496.

The previous prime is 6644621. The next prime is 6644647. The reversal of 6644628 is 8264466.

It is a happy number.

6644628 is a `hidden beast` number, since 6 + 644 + 6 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 6644592 and 6644601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644621) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 13401 + ... + 13887.

Almost surely, 2^6644628 is an apocalyptic number.

It is an amenable number.

6644628 is an abundant number, since it is smaller than the sum of its proper divisors (10230412).

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

6644628 is a wasteful number, since it uses less digits than its factorization.

6644628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876 (or 871 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 6644628 is about 2577.7175950829. The cubic root of 6644628 is about 187.9995850300. Note that the first 3 decimals are identical.

The spelling of 6644628 in words is "six million, six hundred forty-four thousand, six hundred twenty-eight".