2565278 has 4 divisors (see below), whose sum is σ = 3847920. Its totient is φ = 1282638.

The previous prime is 2565263. The next prime is 2565289. The reversal of 2565278 is 8725652.

2565278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 641318 + ... + 641321.

It is an arithmetic number, because the mean of its divisors is an integer number (961980).

2^2565278 is an apocalyptic number.

2565278 is a deficient number, since it is larger than the sum of its proper divisors (1282642).

2565278 is a wasteful number, since it uses less digits than its factorization.

2565278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282641.

The product of its digits is 33600, while the sum is 35.

The square root of 2565278 is about 1601.6485257384. The cubic root of 2565278 is about 136.8920242511.

The spelling of 2565278 in words is "two million, five hundred sixty-five thousand, two hundred seventy-eight".