2805280 has 48 divisors (see below), whose sum is σ = 6735960. Its totient is φ = 1103872.

The previous prime is 2805263. The next prime is 2805311. The reversal of 2805280 is 825082.

It can be written as a sum of positive squares in 4 ways, for example, as 2547216 + 258064 = 1596^2 + 508^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14142 + ... + 14338.

2^2805280 is an apocalyptic number.

2805280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2805280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3367980).

2805280 is an abundant number, since it is smaller than the sum of its proper divisors (3930680).

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

2805280 is a wasteful number, since it uses less digits than its factorization.

2805280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 2805280 is about 1674.8970117592. The cubic root of 2805280 is about 141.0345136242.

The spelling of 2805280 in words is "two million, eight hundred five thousand, two hundred eighty".