81340826 has 16 divisors (see below), whose sum is σ = 139700160. Its totient is φ = 34795680.

The previous prime is 81340823. The next prime is 81340841. The reversal of 81340826 is 62804318.

It is a junction number, because it is equal to n+sod(n) for n = 81340792 and 81340801.

It is not an unprimeable number, because it can be changed into a prime (81340823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (8731260).

Almost surely, 2^81340826 is an apocalyptic number.

81340826 is a deficient number, since it is larger than the sum of its proper divisors (58359334).

81340826 is a wasteful number, since it uses less digits than its factorization.

81340826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 81340826 is about 9018.9149014723. The cubic root of 81340826 is about 433.2808813568.

The spelling of 81340826 in words is "eighty-one million, three hundred forty thousand, eight hundred twenty-six".