81226806 has 8 divisors (see below), whose sum is σ = 162453624. Its totient is φ = 27075600.

The previous prime is 81226759. The next prime is 81226811. The reversal of 81226806 is 60862218.

It is a sphenic number, since it is the product of 3 distinct primes.

81226806 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6768895 + ... + 6768906.

It is an arithmetic number, because the mean of its divisors is an integer number (20306703).

Almost surely, 2^81226806 is an apocalyptic number.

81226806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81226806 is a wasteful number, since it uses less digits than its factorization.

81226806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13537806.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81226806 is about 9012.5915251941. The cubic root of 81226806 is about 433.0783353127.

The spelling of 81226806 in words is "eighty-one million, two hundred twenty-six thousand, eight hundred six".