2005261687 has 8 divisors (see below), whose sum is σ = 2355832080. Its totient is φ = 1682736960.

The previous prime is 2005261681. The next prime is 2005261703. The reversal of 2005261687 is 7861625002.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2005261687 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 (2005261681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7011262 + ... + 7011547.

It is an arithmetic number, because the mean of its divisors is an integer number (294479010).

Almost surely, 2^2005261687 is an apocalyptic number.

2005261687 is a deficient number, since it is larger than the sum of its proper divisors (350570393).

2005261687 is a wasteful number, since it uses less digits than its factorization.

2005261687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14022833.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 2005261687 is about 44780.1483583965. The cubic root of 2005261687 is about 1261.0249674169.

Adding to 2005261687 its reverse (7861625002), we get a palindrome (9866886689).

The spelling of 2005261687 in words is "two billion, five million, two hundred sixty-one thousand, six hundred eighty-seven".