6639069 has 8 divisors (see below), whose sum is σ = 8892000. Its totient is φ = 4406096.

The previous prime is 6639067. The next prime is 6639077. The reversal of 6639069 is 9609366.

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 6639069 - 2¹ = 6639067 is a prime.

It is a super-2 number, since 2×6639069² = 88154474373522, which contains 22 as substring.

6639069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4194 + ... + 5555.

It is an arithmetic number, because the mean of its divisors is an integer number (1111500).

Almost surely, 2^6639069 is an apocalyptic number.

It is an amenable number.

6639069 is a deficient number, since it is larger than the sum of its proper divisors (2252931).

6639069 is a wasteful number, since it uses less digits than its factorization.

6639069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9979.

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 6639069 is about 2576.6390899775. The cubic root of 6639069 is about 187.9471426021.

The spelling of 6639069 in words is "six million, six hundred thirty-nine thousand, sixty-nine".