27805781705 has 32 divisors (see below), whose sum is σ = 38097225600. Its totient is φ = 19312722432.

The previous prime is 27805781699. The next prime is 27805781761. The reversal of 27805781705 is 50718750872.

It is a cyclic number.

It is not a de Polignac number, because 27805781705 - 2³² = 23510814409 is a prime.

It is a super-2 number, since 2×27805781705² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90677 + ... + 252653.

It is an arithmetic number, because the mean of its divisors is an integer number (1190538300).

Almost surely, 2^27805781705 is an apocalyptic number.

It is an amenable number.

27805781705 is a deficient number, since it is larger than the sum of its proper divisors (10291443895).

27805781705 is a wasteful number, since it uses less digits than its factorization.

27805781705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162153.

The product of its (nonzero) digits is 1097600, while the sum is 50.

The spelling of 27805781705 in words is "twenty-seven billion, eight hundred five million, seven hundred eighty-one thousand, seven hundred five".