6699890 has 8 divisors (see below), whose sum is σ = 12059820. Its totient is φ = 2679952.

The previous prime is 6699881. The next prime is 6699893. The reversal of 6699890 is 989966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6255001 + 444889 = 2501^2 + 667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6699893) 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 3 ways as a sum of consecutive naturals, for example, 334985 + ... + 335004.

Almost surely, 2^6699890 is an apocalyptic number.

6699890 is a deficient number, since it is larger than the sum of its proper divisors (5359930).

6699890 is a wasteful number, since it uses less digits than its factorization.

6699890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669996.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 6699890 is about 2588.4145726680. The cubic root of 6699890 is about 188.5193313930.

The spelling of 6699890 in words is "six million, six hundred ninety-nine thousand, eight hundred ninety".