81075366 has 12 divisors (see below), whose sum is σ = 175663332. Its totient is φ = 27025116.

The previous prime is 81075361. The next prime is 81075377. The reversal of 81075366 is 66357018.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81075366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81075361) 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, 2252076 + ... + 2252111.

It is an arithmetic number, because the mean of its divisors is an integer number (14638611).

Almost surely, 2^81075366 is an apocalyptic number.

81075366 is an abundant number, since it is smaller than the sum of its proper divisors (94587966).

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

81075366 is a wasteful number, since it uses less digits than its factorization.

81075366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504195 (or 4504192 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 81075366 is about 9004.1860265101. The cubic root of 81075366 is about 432.8090228039.

It can be divided in two parts, 810 and 75366, that added together give a square (76176 = 276²).

The spelling of 81075366 in words is "eighty-one million, seventy-five thousand, three hundred sixty-six".