81086007786 has 64 divisors (see below), whose sum is σ = 193110220800. Its totient is φ = 22207582656.

The previous prime is 81086007781. The next prime is 81086007809. The reversal of 81086007786 is 68770068018.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81086007781) 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 31 ways as a sum of consecutive naturals, for example, 70170 + ... + 408773.

It is an arithmetic number, because the mean of its divisors is an integer number (3017347200).

Almost surely, 2^81086007786 is an apocalyptic number.

81086007786 is an abundant number, since it is smaller than the sum of its proper divisors (112024213014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81086007786 is a wasteful number, since it uses less digits than its factorization.

81086007786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479123.

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 81086007786 in words is "eighty-one billion, eighty-six million, seven thousand, seven hundred eighty-six".