2778 has 8 divisors (see below), whose sum is σ = 5568. Its totient is φ = 924.

The previous prime is 2777. The next prime is 2789. The reversal of 2778 is 8772.

2778 is nontrivially palindromic in base 16.

2778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

2778 is an admirable number.

2778 is an undulating number in base 16.

2778 is strictly pandigital in base 5.

It is a Curzon number.

It is a plaindrome in base 10 and base 13.

It is a nialpdrome in base 8 and base 15.

It is not an unprimeable number, because it can be changed into a prime (2777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226 + ... + 237.

It is an arithmetic number, because the mean of its divisors is an integer number (696).

2778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2784).

2778 is a wasteful number, since it uses less digits than its factorization.

2778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468.

The product of its digits is 784, while the sum is 24.

The square root of 2778 is about 52.7067358124. The cubic root of 2778 is about 14.0575859373.

It can be divided in two parts, 27 and 78, that added together give a triangular number (105 = T₁₄).

The spelling of 2778 in words is "two thousand, seven hundred seventy-eight".