2812780 has 12 divisors (see below), whose sum is σ = 5906880. Its totient is φ = 1125104.

The previous prime is 2812753. The next prime is 2812801. The reversal of 2812780 is 872182.

It is an Ulam 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, 70300 + ... + 70339.

It is an arithmetic number, because the mean of its divisors is an integer number (492240).

2^2812780 is an apocalyptic number.

2812780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2812780 is an abundant number, since it is smaller than the sum of its proper divisors (3094100).

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

2812780 is a wasteful number, since it uses less digits than its factorization.

2812780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140648 (or 140646 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2812780 is about 1677.1344609184. The cubic root of 2812780 is about 141.1600884449.

The spelling of 2812780 in words is "two million, eight hundred twelve thousand, seven hundred eighty".