2687881 has 4 divisors (see below), whose sum is σ = 3071872. Its totient is φ = 2303892.

The previous prime is 2687879. The next prime is 2687891. The reversal of 2687881 is 1887862.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1887862 = 2 ⋅943931.

It is a cyclic number.

It is not a de Polignac number, because 2687881 - 2¹ = 2687879 is a prime.

It is a super-2 number, since 2×2687881² = 14449408540322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2687821) 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, 191985 + ... + 191998.

It is an arithmetic number, because the mean of its divisors is an integer number (767968).

2^2687881 is an apocalyptic number.

It is an amenable number.

2687881 is a deficient number, since it is larger than the sum of its proper divisors (383991).

2687881 is an equidigital number, since it uses as much as digits as its factorization.

2687881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383990.

The product of its digits is 43008, while the sum is 40.

The square root of 2687881 is about 1639.4758308679. The cubic root of 2687881 is about 139.0390139439.

The spelling of 2687881 in words is "two million, six hundred eighty-seven thousand, eight hundred eighty-one".