2878091 has 4 divisors (see below), whose sum is σ = 2895912. Its totient is φ = 2860272.

The previous prime is 2878067. The next prime is 2878093. The reversal of 2878091 is 1908782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1908782 = 2 ⋅954391.

It is a cyclic number.

It is not a de Polignac number, because 2878091 - 2⁶ = 2878027 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2878093) by changing a digit.

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, 8666 + ... + 8991.

It is an arithmetic number, because the mean of its divisors is an integer number (723978).

2^2878091 is an apocalyptic number.

2878091 is a deficient number, since it is larger than the sum of its proper divisors (17821).

2878091 is a wasteful number, since it uses less digits than its factorization.

2878091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17820.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 2878091 is about 1696.4937370942. The cubic root of 2878091 is about 142.2442895401.

The spelling of 2878091 in words is "two million, eight hundred seventy-eight thousand, ninety-one".