6778081 has 4 divisors (see below), whose sum is σ = 6798532. Its totient is φ = 6757632.

The previous prime is 6778073. The next prime is 6778099. The reversal of 6778081 is 1808776.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1018081 + 5760000 = 1009^2 + 2400^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778081 - 2³ = 6778073 is a prime.

It is a super-2 number, since 2×6778081² = 91884764085122, which contains 22 as substring.

It is a Duffinian number.

6778081 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6778081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6778021) 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, 9720 + ... + 10393.

It is an arithmetic number, because the mean of its divisors is an integer number (1699633).

Almost surely, 2^6778081 is an apocalyptic number.

It is an amenable number.

6778081 is a deficient number, since it is larger than the sum of its proper divisors (20451).

6778081 is a wasteful number, since it uses less digits than its factorization.

6778081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20450.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 6778081 is about 2603.4747934251. The cubic root of 6778081 is about 189.2498678123.

The spelling of 6778081 in words is "six million, seven hundred seventy-eight thousand, eighty-one".