6639275 has 6 divisors (see below), whose sum is σ = 8232732. Its totient is φ = 5311400.

The previous prime is 6639263. The next prime is 6639287. The reversal of 6639275 is 5729366.

It is an interprime number because it is at equal distance from previous prime (6639263) and next prime (6639287).

It is not a de Polignac number, because 6639275 - 2¹⁰ = 6638251 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 132761 + ... + 132810.

It is an arithmetic number, because the mean of its divisors is an integer number (1372122).

Almost surely, 2^6639275 is an apocalyptic number.

6639275 is a deficient number, since it is larger than the sum of its proper divisors (1593457).

6639275 is a wasteful number, since it uses less digits than its factorization.

6639275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265581 (or 265576 counting only the distinct ones).

The product of its digits is 68040, while the sum is 38.

The square root of 6639275 is about 2576.6790642220. The cubic root of 6639275 is about 187.9490864846.

Subtracting from 6639275 its reverse (5729366), we obtain a palindrome (909909).

The spelling of 6639275 in words is "six million, six hundred thirty-nine thousand, two hundred seventy-five".