2687861 has 4 divisors (see below), whose sum is σ = 2932224. Its totient is φ = 2443500.

The previous prime is 2687857. The next prime is 2687869. The reversal of 2687861 is 1687862.

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 2687861 - 2² = 2687857 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 (2687869) 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, 122165 + ... + 122186.

It is an arithmetic number, because the mean of its divisors is an integer number (733056).

2^2687861 is an apocalyptic number.

It is an amenable number.

2687861 is a deficient number, since it is larger than the sum of its proper divisors (244363).

2687861 is a wasteful number, since it uses less digits than its factorization.

2687861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244362.

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

The square root of 2687861 is about 1639.4697313461. The cubic root of 2687861 is about 139.0386690889.

Subtracting from 2687861 its reverse (1687862), we obtain a palindrome (999999).

The spelling of 2687861 in words is "two million, six hundred eighty-seven thousand, eight hundred sixty-one".