2587681 has 8 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 2498640.

The previous prime is 2587649. The next prime is 2587693. The reversal of 2587681 is 1867852.

2587681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2587681 - 2⁵ = 2587649 is a prime.

It is a super-2 number, since 2×2587681² = 13392185915522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2587681.

It is not an unprimeable number, because it can be changed into a prime (2582681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3240 + ... + 3958.

It is an arithmetic number, because the mean of its divisors is an integer number (334800).

2^2587681 is an apocalyptic number.

It is an amenable number.

2587681 is a deficient number, since it is larger than the sum of its proper divisors (90719).

2587681 is an equidigital number, since it uses as much as digits as its factorization.

2587681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839.

The product of its digits is 26880, while the sum is 37.

The square root of 2587681 is about 1608.6270543541. The cubic root of 2587681 is about 137.2893700724.

The spelling of 2587681 in words is "two million, five hundred eighty-seven thousand, six hundred eighty-one".