81444806 has 8 divisors (see below), whose sum is σ = 122211504. Its totient is φ = 40707640.

The previous prime is 81444793. The next prime is 81444809. The reversal of 81444806 is 60844418.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81444809) 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 3 ways as a sum of consecutive naturals, for example, 1796 + ... + 12888.

It is an arithmetic number, because the mean of its divisors is an integer number (15276438).

Almost surely, 2^81444806 is an apocalyptic number.

81444806 is a deficient number, since it is larger than the sum of its proper divisors (40766698).

81444806 is a wasteful number, since it uses less digits than its factorization.

81444806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14766.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 81444806 is about 9024.6776119704. The cubic root of 81444806 is about 433.4654273165.

The spelling of 81444806 in words is "eighty-one million, four hundred forty-four thousand, eight hundred six".