91806782827 has 4 divisors (see below), whose sum is σ = 91814193640. Its totient is φ = 91799372016.

The previous prime is 91806782723. The next prime is 91806782849. The reversal of 91806782827 is 72828760819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72828760819 = 37 ⋅1968344887.

It is a cyclic number.

It is not a de Polignac number, because 91806782827 - 2⁷ = 91806782699 is a prime.

It is a super-2 number, since 2×91806782827² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91806182827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3686793 + ... + 3711610.

It is an arithmetic number, because the mean of its divisors is an integer number (22953548410).

Almost surely, 2^91806782827 is an apocalyptic number.

91806782827 is a deficient number, since it is larger than the sum of its proper divisors (7410813).

91806782827 is a wasteful number, since it uses less digits than its factorization.

91806782827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410812.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 91806782827 in words is "ninety-one billion, eight hundred six million, seven hundred eighty-two thousand, eight hundred twenty-seven".