2780855 has 32 divisors (see below), whose sum is σ = 4313088. Its totient is φ = 1670400.

The previous prime is 2780837. The next prime is 2780873. The reversal of 2780855 is 5580872.

It is an interprime number because it is at equal distance from previous prime (2780837) and next prime (2780873).

It is not a de Polignac number, because 2780855 - 2⁸ = 2780599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a d-powerful number, because it can be written as 2 + 7⁷ + 8² + 0 + 8⁴ + 5² + 5⁹ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11819 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (134784).

2^2780855 is an apocalyptic number.

2780855 is a deficient number, since it is larger than the sum of its proper divisors (1532233).

2780855 is a wasteful number, since it uses less digits than its factorization.

2780855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 2780855 is about 1667.5895778038. The cubic root of 2780855 is about 140.6240003221.

The spelling of 2780855 in words is "two million, seven hundred eighty thousand, eight hundred fifty-five".