81854044 has 12 divisors (see below), whose sum is σ = 144207000. Its totient is φ = 40652048.

The previous prime is 81854041. The next prime is 81854051. The reversal of 81854044 is 44045818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81854041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68074 + ... + 69265.

It is an arithmetic number, because the mean of its divisors is an integer number (12017250).

Almost surely, 2^81854044 is an apocalyptic number.

It is an amenable number.

81854044 is a deficient number, since it is larger than the sum of its proper divisors (62352956).

81854044 is a wasteful number, since it uses less digits than its factorization.

81854044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137492 (or 137490 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 81854044 is about 9047.3224768436. The cubic root of 81854044 is about 434.1902299848.

The spelling of 81854044 in words is "eighty-one million, eight hundred fifty-four thousand, forty-four".