6643087 has 4 divisors (see below), whose sum is σ = 7247016. Its totient is φ = 6039160.

The previous prime is 6643069. The next prime is 6643097. The reversal of 6643087 is 7803466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6643087 - 2¹¹ = 6641039 is a prime.

It is a Duffinian number.

6643087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301948 + ... + 301969.

It is an arithmetic number, because the mean of its divisors is an integer number (1811754).

Almost surely, 2^6643087 is an apocalyptic number.

6643087 is a deficient number, since it is larger than the sum of its proper divisors (603929).

6643087 is a wasteful number, since it uses less digits than its factorization.

6643087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603928.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 6643087 is about 2577.4186699099. The cubic root of 6643087 is about 187.9850504938.

The spelling of 6643087 in words is "six million, six hundred forty-three thousand, eighty-seven".