6778 has 4 divisors (see below), whose sum is σ = 10170. Its totient is φ = 3388.

The previous prime is 6763. The next prime is 6779. The reversal of 6778 is 8776.

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

It can be written as a sum of positive squares in only one way, i.e., 3969 + 2809 = 63^2 + 53^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1693 + ... + 1696.

2⁶⁷⁷⁸ is an apocalyptic number.

6778 is a deficient number, since it is larger than the sum of its proper divisors (3392).

6778 is a wasteful number, since it uses less digits than its factorization.

6778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3391.

The product of its digits is 2352, while the sum is 28.

The square root of 6778 is about 82.3286098510. The cubic root of 6778 is about 18.9249113946.

It can be divided in two parts, 6 and 778, that added together give a square (784 = 28²).

The spelling of 6778 in words is "six thousand, seven hundred seventy-eight".