2678861 has 4 divisors (see below), whose sum is σ = 2718912. Its totient is φ = 2638812.

The previous prime is 2678839. The next prime is 2678873. The reversal of 2678861 is 1688762.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2678861 - 2¹⁰ = 2677837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19925 + ... + 20058.

It is an arithmetic number, because the mean of its divisors is an integer number (679728).

2^2678861 is an apocalyptic number.

It is an amenable number.

2678861 is a deficient number, since it is larger than the sum of its proper divisors (40051).

2678861 is an equidigital number, since it uses as much as digits as its factorization.

2678861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40050.

The product of its digits is 32256, while the sum is 38.

The square root of 2678861 is about 1636.7226399118. The cubic root of 2678861 is about 138.8833104485.

Subtracting from 2678861 its reverse (1688762), we obtain a palindrome (990099).

It can be divided in two parts, 26 and 78861, that added together give a palindrome (78887).

The spelling of 2678861 in words is "two million, six hundred seventy-eight thousand, eight hundred sixty-one".