6639285 has 8 divisors (see below), whose sum is σ = 10622880. Its totient is φ = 3540944.

The previous prime is 6639263. The next prime is 6639287. The reversal of 6639285 is 5829366.

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 6639285 - 2⁹ = 6638773 is a prime.

It is a super-2 number, since 2×6639285² = 88160210622450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639287) 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, 221295 + ... + 221324.

It is an arithmetic number, because the mean of its divisors is an integer number (1327860).

Almost surely, 2^6639285 is an apocalyptic number.

It is an amenable number.

6639285 is a deficient number, since it is larger than the sum of its proper divisors (3983595).

6639285 is a wasteful number, since it uses less digits than its factorization.

6639285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442627.

The product of its digits is 77760, while the sum is 39.

The square root of 6639285 is about 2576.6810047035. The cubic root of 6639285 is about 187.9491808468.

The spelling of 6639285 in words is "six million, six hundred thirty-nine thousand, two hundred eighty-five".