6645572 has 12 divisors (see below), whose sum is σ = 12313980. Its totient is φ = 3127296.

The previous prime is 6645571. The next prime is 6645577. The reversal of 6645572 is 2755466.

It can be written as a sum of positive squares in 2 ways, for example, as 2709316 + 3936256 = 1646^2 + 1984^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6645571) 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 3 ways as a sum of consecutive naturals, for example, 48797 + ... + 48932.

It is an arithmetic number, because the mean of its divisors is an integer number (1026165).

Almost surely, 2^6645572 is an apocalyptic number.

It is an amenable number.

6645572 is a deficient number, since it is larger than the sum of its proper divisors (5668408).

6645572 is a wasteful number, since it uses less digits than its factorization.

6645572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97750 (or 97748 counting only the distinct ones).

The product of its digits is 50400, while the sum is 35.

The square root of 6645572 is about 2577.9006963031. The cubic root of 6645572 is about 188.0084876204.

The spelling of 6645572 in words is "six million, six hundred forty-five thousand, five hundred seventy-two".