91006781782 has 32 divisors (see below), whose sum is σ = 160086389760. Its totient is φ = 37992084480.

The previous prime is 91006781779. The next prime is 91006781783. The reversal of 91006781782 is 28718760019.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91006781783) 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 15 ways as a sum of consecutive naturals, for example, 188907 + ... + 466582.

It is an arithmetic number, because the mean of its divisors is an integer number (5002699680).

Almost surely, 2^91006781782 is an apocalyptic number.

91006781782 is a deficient number, since it is larger than the sum of its proper divisors (69079607978).

91006781782 is a wasteful number, since it uses less digits than its factorization.

91006781782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655756.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 91006781782 in words is "ninety-one billion, six million, seven hundred eighty-one thousand, seven hundred eighty-two".