6778449 has 6 divisors (see below), whose sum is σ = 9791106. Its totient is φ = 4518960.

The previous prime is 6778439. The next prime is 6778463. The reversal of 6778449 is 9448776.

It can be written as a sum of positive squares in only one way, i.e., 5198400 + 1580049 = 2280^2 + 1257^2 .

It is not a de Polignac number, because 6778449 - 2⁴ = 6778433 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁸ + 7² + 7⁵ + 8⁵ + 4⁶ + 4⁹ + 9⁷ .

It is not an unprimeable number, because it can be changed into a prime (6778439) 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 5 ways as a sum of consecutive naturals, for example, 376572 + ... + 376589.

It is an arithmetic number, because the mean of its divisors is an integer number (1631851).

Almost surely, 2^6778449 is an apocalyptic number.

It is an amenable number.

6778449 is a deficient number, since it is larger than the sum of its proper divisors (3012657).

6778449 is a wasteful number, since it uses less digits than its factorization.

6778449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753167 (or 753164 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 6778449 is about 2603.5454672427. The cubic root of 6778449 is about 189.2532927094.

It can be divided in two parts, 6778 and 449, that added together give a palindrome (7227).

The spelling of 6778449 in words is "six million, seven hundred seventy-eight thousand, four hundred forty-nine".