6988666 has 8 divisors (see below), whose sum is σ = 11099700. Its totient is φ = 3288768.

The previous prime is 6988643. The next prime is 6988669. The reversal of 6988666 is 6668896.

It can be written as a sum of positive squares in 2 ways, for example, as 6869641 + 119025 = 2621^2 + 345^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6988669) 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, 102741 + ... + 102808.

Almost surely, 2^6988666 is an apocalyptic number.

6988666 is a deficient number, since it is larger than the sum of its proper divisors (4111034).

6988666 is a wasteful number, since it uses less digits than its factorization.

6988666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205568.

The product of its digits is 746496, while the sum is 49.

The square root of 6988666 is about 2643.6085186729. The cubic root of 6988666 is about 191.1898188763.

The spelling of 6988666 in words is "six million, nine hundred eighty-eight thousand, six hundred sixty-six".