6643698 has 16 divisors (see below), whose sum is σ = 13377216. Its totient is φ = 2199600.

The previous prime is 6643691. The next prime is 6643699. The reversal of 6643698 is 8963466.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6643691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2761 + ... + 4572.

It is an arithmetic number, because the mean of its divisors is an integer number (836076).

Almost surely, 2^6643698 is an apocalyptic number.

6643698 is an abundant number, since it is smaller than the sum of its proper divisors (6733518).

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

6643698 is a wasteful number, since it uses less digits than its factorization.

6643698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7489.

The product of its digits is 186624, while the sum is 42.

The square root of 6643698 is about 2577.5371966278. The cubic root of 6643698 is about 187.9908136450.

The spelling of 6643698 in words is "six million, six hundred forty-three thousand, six hundred ninety-eight".