2887681 has 4 divisors (see below), whose sum is σ = 2980864. Its totient is φ = 2794500.

The previous prime is 2887669. The next prime is 2887693. The reversal of 2887681 is 1867882.

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 an interprime number because it is at equal distance from previous prime (2887669) and next prime (2887693).

It is a cyclic number.

It is not a de Polignac number, because 2887681 - 2⁵ = 2887649 is a prime.

It is a super-2 number, since 2×2887681² = 16677403115522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2887631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46545 + ... + 46606.

It is an arithmetic number, because the mean of its divisors is an integer number (745216).

It is a Proth number, since it is equal to 705 ⋅ 2¹² + 1 and 705 < 2¹².

2^2887681 is an apocalyptic number.

It is an amenable number.

2887681 is a deficient number, since it is larger than the sum of its proper divisors (93183).

2887681 is an equidigital number, since it uses as much as digits as its factorization.

2887681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93182.

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

The square root of 2887681 is about 1699.3178042968. The cubic root of 2887681 is about 142.4021036858.

The spelling of 2887681 in words is "two million, eight hundred eighty-seven thousand, six hundred eighty-one".