81186352 has 40 divisors (see below), whose sum is σ = 170145360. Its totient is φ = 37305600.

The previous prime is 81186331. The next prime is 81186383. The reversal of 81186352 is 25368118.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 55227 + ... + 56677.

It is an arithmetic number, because the mean of its divisors is an integer number (4253634).

Almost surely, 2^81186352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81186352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85072680).

81186352 is an abundant number, since it is smaller than the sum of its proper divisors (88959008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81186352 is a wasteful number, since it uses less digits than its factorization.

81186352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741 (or 1735 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 81186352 is about 9010.3469411560. The cubic root of 81186352 is about 433.0064269483.

The spelling of 81186352 in words is "eighty-one million, one hundred eighty-six thousand, three hundred fifty-two".