11805280087 has 4 divisors (see below), whose sum is σ = 12005369640. Its totient is φ = 11605190536.

The previous prime is 11805280073. The next prime is 11805280093. The reversal of 11805280087 is 78008250811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11805280087 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 (11805280057) 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, 100044688 + ... + 100044805.

It is an arithmetic number, because the mean of its divisors is an integer number (3001342410).

Almost surely, 2^11805280087 is an apocalyptic number.

11805280087 is a deficient number, since it is larger than the sum of its proper divisors (200089553).

11805280087 is an equidigital number, since it uses as much as digits as its factorization.

11805280087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200089552.

The product of its (nonzero) digits is 35840, while the sum is 40.

The spelling of 11805280087 in words is "eleven billion, eight hundred five million, two hundred eighty thousand, eighty-seven".