6643172 has 6 divisors (see below), whose sum is σ = 11625558. Its totient is φ = 3321584.

The previous prime is 6643151. The next prime is 6643181. The reversal of 6643172 is 2713466.

It can be written as a sum of positive squares in only one way, i.e., 6635776 + 7396 = 2576^2 + 86^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830393 + ... + 830400.

It is an arithmetic number, because the mean of its divisors is an integer number (1937593).

Almost surely, 2^6643172 is an apocalyptic number.

It is an amenable number.

6643172 is a deficient number, since it is larger than the sum of its proper divisors (4982386).

6643172 is a wasteful number, since it uses less digits than its factorization.

6643172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660797 (or 1660795 counting only the distinct ones).

The product of its digits is 6048, while the sum is 29.

The square root of 6643172 is about 2577.4351592232. The cubic root of 6643172 is about 187.9858522627.

The spelling of 6643172 in words is "six million, six hundred forty-three thousand, one hundred seventy-two".