2805978 has 16 divisors (see below), whose sum is σ = 6413760. Its totient is φ = 801696.

The previous prime is 2805973. The next prime is 2805989. The reversal of 2805978 is 8795082.

2805978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2805973) 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 7 ways as a sum of consecutive naturals, for example, 33363 + ... + 33446.

It is an arithmetic number, because the mean of its divisors is an integer number (400860).

2^2805978 is an apocalyptic number.

2805978 is an abundant number, since it is smaller than the sum of its proper divisors (3607782).

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

2805978 is a wasteful number, since it uses less digits than its factorization.

2805978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66821.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 2805978 is about 1675.1053698201. The cubic root of 2805978 is about 141.0462098930.

The spelling of 2805978 in words is "two million, eight hundred five thousand, nine hundred seventy-eight".