2808861 has 16 divisors (see below), whose sum is σ = 4174848. Its totient is φ = 1665200.

The previous prime is 2808847. The next prime is 2808863. The reversal of 2808861 is 1688082.

It is a cyclic number.

It is not a de Polignac number, because 2808861 - 2⁶ = 2808797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2808863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (260928).

2^2808861 is an apocalyptic number.

It is an amenable number.

2808861 is a deficient number, since it is larger than the sum of its proper divisors (1365987).

2808861 is a wasteful number, since it uses less digits than its factorization.

2808861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 2808861 is about 1675.9656917730. The cubic root of 2808861 is about 141.0944992994.

The spelling of 2808861 in words is "two million, eight hundred eight thousand, eight hundred sixty-one".