6668787 has 4 divisors (see below), whose sum is σ = 8891720. Its totient is φ = 4445856.

The previous prime is 6668759. The next prime is 6668789. The reversal of 6668787 is 7878666.

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

It is not a de Polignac number, because 6668787 - 2⁶ = 6668723 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668789) 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, 1111462 + ... + 1111467.

It is an arithmetic number, because the mean of its divisors is an integer number (2222930).

Almost surely, 2^6668787 is an apocalyptic number.

6668787 is a deficient number, since it is larger than the sum of its proper divisors (2222933).

6668787 is a wasteful number, since it uses less digits than its factorization.

6668787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222932.

The product of its digits is 677376, while the sum is 48.

The square root of 6668787 is about 2582.3994656133. The cubic root of 6668787 is about 188.2271567618.

It can be divided in two parts, 666 and 8787, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 6668787 in words is "six million, six hundred sixty-eight thousand, seven hundred eighty-seven".