6639089 has 8 divisors (see below), whose sum is σ = 6865992. Its totient is φ = 6415360.

The previous prime is 6639077. The next prime is 6639107. The reversal of 6639089 is 9809366.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 6630625 = 92^2 + 2575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6639089 - 2²⁰ = 5590513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639049) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 3917 + ... + 5349.

It is an arithmetic number, because the mean of its divisors is an integer number (858249).

Almost surely, 2^6639089 is an apocalyptic number.

It is an amenable number.

6639089 is a deficient number, since it is larger than the sum of its proper divisors (226903).

6639089 is a wasteful number, since it uses less digits than its factorization.

6639089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 6639089 is about 2576.6429709993. The cubic root of 6639089 is about 187.9473313303.

The spelling of 6639089 in words is "six million, six hundred thirty-nine thousand, eighty-nine".