827878041805 has 4 divisors (see below), whose sum is σ = 993453650172. Its totient is φ = 662302433440.

The previous prime is 827878041799. The next prime is 827878041847. The reversal of 827878041805 is 508140878728.

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

It can be written as a sum of positive squares in 2 ways, for example, as 466241786761 + 361636255044 = 682819^2 + 601362^2 .

It is not a de Polignac number, because 827878041805 - 2⁹ = 827878041293 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 827878041805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82787804176 + ... + 82787804185.

It is an arithmetic number, because the mean of its divisors is an integer number (248363412543).

Almost surely, 2^827878041805 is an apocalyptic number.

It is an amenable number.

827878041805 is a deficient number, since it is larger than the sum of its proper divisors (165575608367).

827878041805 is a wasteful number, since it uses less digits than its factorization.

827878041805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165575608366.

The product of its (nonzero) digits is 8028160, while the sum is 58.

The spelling of 827878041805 in words is "eight hundred twenty-seven billion, eight hundred seventy-eight million, forty-one thousand, eight hundred five".