2787891 has 8 divisors (see below), whose sum is σ = 3730320. Its totient is φ = 1852032.

The previous prime is 2787859. The next prime is 2787907. The reversal of 2787891 is 1987872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2787891 - 2⁵ = 2787859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (466290).

2^2787891 is an apocalyptic number.

2787891 is a deficient number, since it is larger than the sum of its proper divisors (942429).

2787891 is a wasteful number, since it uses less digits than its factorization.

2787891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285.

The product of its digits is 56448, while the sum is 42.

The square root of 2787891 is about 1669.6978768628. The cubic root of 2787891 is about 140.7425007073.

The spelling of 2787891 in words is "two million, seven hundred eighty-seven thousand, eight hundred ninety-one".