2780255 has 4 divisors (see below), whose sum is σ = 3336312. Its totient is φ = 2224200.

The previous prime is 2780243. The next prime is 2780273. The reversal of 2780255 is 5520872.

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

It is a de Polignac number, because none of the positive numbers 2^k-2780255 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278021 + ... + 278030.

It is an arithmetic number, because the mean of its divisors is an integer number (834078).

2^2780255 is an apocalyptic number.

2780255 is a deficient number, since it is larger than the sum of its proper divisors (556057).

2780255 is an equidigital number, since it uses as much as digits as its factorization.

2780255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556056.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 2780255 is about 1667.4096677182. The cubic root of 2780255 is about 140.6138858706.

The spelling of 2780255 in words is "two million, seven hundred eighty thousand, two hundred fifty-five".