2809878 has 16 divisors (see below), whose sum is σ = 5750976. Its totient is φ = 914760.

The previous prime is 2809867. The next prime is 2809883. The reversal of 2809878 is 8789082.

It is a happy number.

It is a congruent number.

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, 5188 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (359436).

2^2809878 is an apocalyptic number.

2809878 is an abundant number, since it is smaller than the sum of its proper divisors (2941098).

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

2809878 is a wasteful number, since it uses less digits than its factorization.

2809878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10939.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 2809878 is about 1676.2690714799. The cubic root of 2809878 is about 141.1115258678. Note that the first 3 decimals are identical.

The spelling of 2809878 in words is "two million, eight hundred nine thousand, eight hundred seventy-eight".