6641689 has 4 divisors (see below), whose sum is σ = 6754320. Its totient is φ = 6529060.

The previous prime is 6641683. The next prime is 6641693. The reversal of 6641689 is 9861466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6641689 - 2³ = 6641681 is a prime.

It is a super-2 number, since 2×6641689² = 88224065545442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6641681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56227 + ... + 56344.

It is an arithmetic number, because the mean of its divisors is an integer number (1688580).

Almost surely, 2^6641689 is an apocalyptic number.

It is an amenable number.

6641689 is a deficient number, since it is larger than the sum of its proper divisors (112631).

6641689 is a wasteful number, since it uses less digits than its factorization.

6641689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112630.

The product of its digits is 62208, while the sum is 40.

The square root of 6641689 is about 2577.1474540662. The cubic root of 6641689 is about 187.9718627726.

The spelling of 6641689 in words is "six million, six hundred forty-one thousand, six hundred eighty-nine".