6644625 has 64 divisors (see below), whose sum is σ = 12579840. Its totient is φ = 3091200.

The previous prime is 6644621. The next prime is 6644647. The reversal of 6644625 is 5264466.

It is not a de Polignac number, because 6644625 - 2² = 6644621 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 141352 + ... + 141398.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

Almost surely, 2^6644625 is an apocalyptic number.

6644625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6644625 is a deficient number, since it is larger than the sum of its proper divisors (5935215).

6644625 is a wasteful number, since it uses less digits than its factorization.

6644625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 97 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

The square root of 6644625 is about 2577.7170131727. The cubic root of 6644625 is about 187.9995567365. Note that the first 3 decimals are identical.

The spelling of 6644625 in words is "six million, six hundred forty-four thousand, six hundred twenty-five".