81223386 has 8 divisors (see below), whose sum is σ = 162446784. Its totient is φ = 27074460.

The previous prime is 81223369. The next prime is 81223397. The reversal of 81223386 is 68332218.

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

81223386 is an admirable number.

It is an unprimeable number.

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, 6768610 + ... + 6768621.

It is an arithmetic number, because the mean of its divisors is an integer number (20305848).

Almost surely, 2^81223386 is an apocalyptic number.

81223386 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.

81223386 is a wasteful number, since it uses less digits than its factorization.

81223386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13537236.

The product of its digits is 13824, while the sum is 33.

The square root of 81223386 is about 9012.4017886466. The cubic root of 81223386 is about 433.0722570701.

The spelling of 81223386 in words is "eighty-one million, two hundred twenty-three thousand, three hundred eighty-six".