81446018 has 16 divisors (see below), whose sum is σ = 125483904. Its totient is φ = 39628080.

The previous prime is 81446009. The next prime is 81446023. The reversal of 81446018 is 81064418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14621 + ... + 19407.

It is an arithmetic number, because the mean of its divisors is an integer number (7842744).

Almost surely, 2^81446018 is an apocalyptic number.

81446018 is a deficient number, since it is larger than the sum of its proper divisors (44037886).

81446018 is a wasteful number, since it uses less digits than its factorization.

81446018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 81446018 is about 9024.7447609337. The cubic root of 81446018 is about 433.4675774741.

The spelling of 81446018 in words is "eighty-one million, four hundred forty-six thousand, eighteen".