6639087 has 32 divisors (see below), whose sum is σ = 11063808. Its totient is φ = 3447936.

The previous prime is 6639077. The next prime is 6639107. The reversal of 6639087 is 7809366.

It is not a de Polignac number, because 6639087 - 2¹⁴ = 6622703 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

6639087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22513 + ... + 22805.

It is an arithmetic number, because the mean of its divisors is an integer number (345744).

Almost surely, 2^6639087 is an apocalyptic number.

6639087 is a deficient number, since it is larger than the sum of its proper divisors (4424721).

6639087 is a wasteful number, since it uses less digits than its factorization.

6639087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 6639087 is about 2576.6425828974. The cubic root of 6639087 is about 187.9473124575.

The spelling of 6639087 in words is "six million, six hundred thirty-nine thousand, eighty-seven".