81344186 has 48 divisors (see below), whose sum is σ = 158323200. Its totient is φ = 30650400.

The previous prime is 81344177. The next prime is 81344189. The reversal of 81344186 is 68144318.

It is a super-3 number, since 3×81344186³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81344189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51740 + ... + 53288.

It is an arithmetic number, because the mean of its divisors is an integer number (3298400).

Almost surely, 2^81344186 is an apocalyptic number.

81344186 is a deficient number, since it is larger than the sum of its proper divisors (76979014).

81344186 is a wasteful number, since it uses less digits than its factorization.

81344186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611 (or 1600 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 81344186 is about 9019.1011747291. The cubic root of 81344186 is about 433.2868472158.

The spelling of 81344186 in words is "eighty-one million, three hundred forty-four thousand, one hundred eighty-six".