6778257 has 16 divisors (see below), whose sum is σ = 9901440. Its totient is φ = 4105472.

The previous prime is 6778249. The next prime is 6778267. The reversal of 6778257 is 7528776.

It is not a de Polignac number, because 6778257 - 2³ = 6778249 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6778207) 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 15 ways as a sum of consecutive naturals, for example, 813 + ... + 3770.

It is an arithmetic number, because the mean of its divisors is an integer number (618840).

Almost surely, 2^6778257 is an apocalyptic number.

It is an amenable number.

6778257 is a deficient number, since it is larger than the sum of its proper divisors (3123183).

6778257 is a wasteful number, since it uses less digits than its factorization.

6778257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4632.

The product of its digits is 164640, while the sum is 42.

The square root of 6778257 is about 2603.5085941859. The cubic root of 6778257 is about 189.2515058220.

The spelling of 6778257 in words is "six million, seven hundred seventy-eight thousand, two hundred fifty-seven".