81444422 has 8 divisors (see below), whose sum is σ = 122705496. Its totient is φ = 40542592.

The previous prime is 81444413. The next prime is 81444439. The reversal of 81444422 is 22444418.

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

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, 89243 + ... + 90150.

It is an arithmetic number, because the mean of its divisors is an integer number (15338187).

Almost surely, 2^81444422 is an apocalyptic number.

81444422 is a deficient number, since it is larger than the sum of its proper divisors (41261074).

81444422 is a wasteful number, since it uses less digits than its factorization.

81444422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179622.

The product of its digits is 8192, while the sum is 29.

The square root of 81444422 is about 9024.6563369471. The cubic root of 81444422 is about 433.4647460740.

The spelling of 81444422 in words is "eighty-one million, four hundred forty-four thousand, four hundred twenty-two".