6778513 has 6 divisors (see below), whose sum is σ = 7885266. Its totient is φ = 5810112.

The previous prime is 6778483. The next prime is 6778517. The reversal of 6778513 is 3158776.

It can be written as a sum of positive squares in only one way, i.e., 4739329 + 2039184 = 2177^2 + 1428^2 .

It is not a de Polignac number, because 6778513 - 2¹³ = 6770321 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6778517) 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, 69120 + ... + 69217.

It is an arithmetic number, because the mean of its divisors is an integer number (1314211).

Almost surely, 2^6778513 is an apocalyptic number.

It is an amenable number.

6778513 is a deficient number, since it is larger than the sum of its proper divisors (1106753).

6778513 is a wasteful number, since it uses less digits than its factorization.

6778513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138351 (or 138344 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 6778513 is about 2603.5577581456. The cubic root of 6778513 is about 189.2538883310.

The spelling of 6778513 in words is "six million, seven hundred seventy-eight thousand, five hundred thirteen".