6778961 has 4 divisors (see below), whose sum is σ = 7747392. Its totient is φ = 5810532.

The previous prime is 6778949. The next prime is 6778963. The reversal of 6778961 is 1698776.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-6778961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6778963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484205 + ... + 484218.

It is an arithmetic number, because the mean of its divisors is an integer number (1936848).

Almost surely, 2^6778961 is an apocalyptic number.

It is an amenable number.

6778961 is a deficient number, since it is larger than the sum of its proper divisors (968431).

6778961 is an equidigital number, since it uses as much as digits as its factorization.

6778961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968430.

The product of its digits is 127008, while the sum is 44.

The square root of 6778961 is about 2603.6437928411. The cubic root of 6778961 is about 189.2580575775.

The spelling of 6778961 in words is "six million, seven hundred seventy-eight thousand, nine hundred sixty-one".