6639345 has 12 divisors (see below), whose sum is σ = 11508276. Its totient is φ = 3540960.

The previous prime is 6639337. The next prime is 6639349. The reversal of 6639345 is 5439366.

It can be written as a sum of positive squares in 2 ways, for example, as 1065024 + 5574321 = 1032^2 + 2361^2 .

It is not a de Polignac number, because 6639345 - 2³ = 6639337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6639349) 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 11 ways as a sum of consecutive naturals, for example, 73726 + ... + 73815.

It is an arithmetic number, because the mean of its divisors is an integer number (959023).

Almost surely, 2^6639345 is an apocalyptic number.

It is an amenable number.

6639345 is a deficient number, since it is larger than the sum of its proper divisors (4868931).

6639345 is a wasteful number, since it uses less digits than its factorization.

6639345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147552 (or 147549 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 6639345 is about 2576.6926475620. The cubic root of 6639345 is about 187.9497470181.

The spelling of 6639345 in words is "six million, six hundred thirty-nine thousand, three hundred forty-five".