6687779 has 8 divisors (see below), whose sum is σ = 7975680. Its totient is φ = 5483016.

The previous prime is 6687773. The next prime is 6687781. The reversal of 6687779 is 9777866.

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

It is not a de Polignac number, because 6687779 - 2⁴ = 6687763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6687773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20609 + ... + 20930.

It is an arithmetic number, because the mean of its divisors is an integer number (996960).

Almost surely, 2^6687779 is an apocalyptic number.

6687779 is a deficient number, since it is larger than the sum of its proper divisors (1287901).

6687779 is a wasteful number, since it uses less digits than its factorization.

6687779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41569.

The product of its digits is 889056, while the sum is 50.

The square root of 6687779 is about 2586.0740515306. The cubic root of 6687779 is about 188.4056710833.

The spelling of 6687779 in words is "six million, six hundred eighty-seven thousand, seven hundred seventy-nine".