81327366 has 12 divisors (see below), whose sum is σ = 176209332. Its totient is φ = 27109116.

The previous prime is 81327361. The next prime is 81327377. The reversal of 81327366 is 66372318.

It is a happy number.

It is a super-2 number, since 2×81327366² = 13228280920995912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81327366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81327361) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2259076 + ... + 2259111.

It is an arithmetic number, because the mean of its divisors is an integer number (14684111).

Almost surely, 2^81327366 is an apocalyptic number.

81327366 is an abundant number, since it is smaller than the sum of its proper divisors (94881966).

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

81327366 is a wasteful number, since it uses less digits than its factorization.

81327366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518195 (or 4518192 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 81327366 is about 9018.1686610974. The cubic root of 81327366 is about 433.2569807619.

The spelling of 81327366 in words is "eighty-one million, three hundred twenty-seven thousand, three hundred sixty-six".