2820256 has 24 divisors (see below), whose sum is σ = 5733504. Its totient is φ = 1364160.

The previous prime is 2820239. The next prime is 2820263. The reversal of 2820256 is 6520282.

It is a self number, because there is not a number n which added to its sum of digits gives 2820256.

It is an unprimeable number.

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, 430 + ... + 2413.

It is an arithmetic number, because the mean of its divisors is an integer number (238896).

2^2820256 is an apocalyptic number.

It is an amenable number.

2820256 is an abundant number, since it is smaller than the sum of its proper divisors (2913248).

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

2820256 is a wasteful number, since it uses less digits than its factorization.

2820256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 2876 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2820256 is about 1679.3617835356. The cubic root of 2820256 is about 141.2850394707.

The spelling of 2820256 in words is "two million, eight hundred twenty thousand, two hundred fifty-six".