2605778 has 16 divisors (see below), whose sum is σ = 4488000. Its totient is φ = 1111536.

The previous prime is 2605769. The next prime is 2605781. The reversal of 2605778 is 8775062.

2605778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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, 4973 + ... + 5471.

It is an arithmetic number, because the mean of its divisors is an integer number (280500).

2^2605778 is an apocalyptic number.

2605778 is a deficient number, since it is larger than the sum of its proper divisors (1882222).

2605778 is a wasteful number, since it uses less digits than its factorization.

2605778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 2605778 is about 1614.2422370883. The cubic root of 2605778 is about 137.6086722157.

The spelling of 2605778 in words is "two million, six hundred five thousand, seven hundred seventy-eight".