81852184 has 16 divisors (see below), whose sum is σ = 153785520. Its totient is φ = 40842720.

The previous prime is 81852167. The next prime is 81852223. The reversal of 81852184 is 48125818.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6147 + ... + 14194.

It is an arithmetic number, because the mean of its divisors is an integer number (9611595).

Almost surely, 2^81852184 is an apocalyptic number.

It is an amenable number.

81852184 is a deficient number, since it is larger than the sum of its proper divisors (71933336).

81852184 is a wasteful number, since it uses less digits than its factorization.

81852184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20850 (or 20846 counting only the distinct ones).

The product of its digits is 20480, while the sum is 37.

The square root of 81852184 is about 9047.2196834166. The cubic root of 81852184 is about 434.1869412043.

The spelling of 81852184 in words is "eighty-one million, eight hundred fifty-two thousand, one hundred eighty-four".