2881820 has 24 divisors (see below), whose sum is σ = 6123600. Its totient is φ = 1139072.

The previous prime is 2881799. The next prime is 2881859. The reversal of 2881820 is 281882.

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 7 ways as a sum of consecutive naturals, for example, 971 + ... + 2589.

It is an arithmetic number, because the mean of its divisors is an integer number (255150).

2^2881820 is an apocalyptic number.

2881820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2881820 is an abundant number, since it is smaller than the sum of its proper divisors (3241780).

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

2881820 is a wasteful number, since it uses less digits than its factorization.

2881820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717 (or 1715 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 2881820 is about 1697.5924128011. The cubic root of 2881820 is about 142.3056959882.

The spelling of 2881820 in words is "two million, eight hundred eighty-one thousand, eight hundred twenty".