2655778 has 4 divisors (see below), whose sum is σ = 3983670. Its totient is φ = 1327888.

The previous prime is 2655773. The next prime is 2655781. The reversal of 2655778 is 8775562.

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., 2647129 + 8649 = 1627^2 + 93^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2655778.

It is not an unprimeable number, because it can be changed into a prime (2655773) 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 as a sum of consecutive naturals, namely, 663943 + ... + 663946.

2^2655778 is an apocalyptic number.

2655778 is a deficient number, since it is larger than the sum of its proper divisors (1327892).

2655778 is a wasteful number, since it uses less digits than its factorization.

2655778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327891.

The product of its digits is 117600, while the sum is 40.

The square root of 2655778 is about 1629.6557918775. The cubic root of 2655778 is about 138.4832528939.

The spelling of 2655778 in words is "two million, six hundred fifty-five thousand, seven hundred seventy-eight".