6643488 has 24 divisors (see below), whose sum is σ = 17439408. Its totient is φ = 2214464.

The previous prime is 6643487. The next prime is 6643489. The reversal of 6643488 is 8843466.

It is an interprime number because it is at equal distance from previous prime (6643487) and next prime (6643489).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×6643488² = 88271865612288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (6643487) 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, 34506 + ... + 34697.

It is an arithmetic number, because the mean of its divisors is an integer number (726642).

Almost surely, 2^6643488 is an apocalyptic number.

It is an amenable number.

6643488 is an abundant number, since it is smaller than the sum of its proper divisors (10795920).

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

6643488 is a wasteful number, since it uses less digits than its factorization.

6643488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69216 (or 69208 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 6643488 is about 2577.4964597454. The cubic root of 6643488 is about 187.9888328964.

The spelling of 6643488 in words is "six million, six hundred forty-three thousand, four hundred eighty-eight".